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High Frequency (HF)
| Inactive (No longer in use) |
Active (Currently in active use) |
Status Unknown or Intermittent |
| Signal Name | Description | Frequency | Mode | Modulation | Bandwidth | Location | Sample Audio | Waterfall image |
|---|---|---|---|---|---|---|---|---|
| 'Ghadir' OTH Radar | 'Ghadir', is an Iranian over the horizon radar, part of Iran's Sepehr Phased Radar System. | 28 MHz — 29.7 MHz | AM | Pulse | 60 kHz — 1 MHz | Iran |  |
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| 29B6 'Kontayner' OTH Radar | 29B6, nicknamed 'Kontayner', is a Russian over the horizon radar. It is currently very active in Europe. | 6.1 MHz — 32 MHz | USB | FMOP | 3.5 kHz — 28 kHz | Russia |  |
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| ALE-400 | ALE-400 is an amateur version of the 2G ALE standard. It is adapted to the demands of amateur radio emergency traffic handling. | 1.806 MHz — 144.163 MHz | USB | MFSK | 400 Hz | Worldwide |  |
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| ARQ-E(E3) | ARQ-E, also known as ARQ-1000 Duplex or ARQ-1000D, is a synchronous full-duplex ARQ system. ARQ-E3 is a variant that uses a different alphabet encoding. Mainly used by French Military Forces. Stations commonly idled for hours on end. | 3 MHz — 30 MHz | USB | FSK | 85 Hz — 850 Hz | Worldwide |  |
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| ARQ-M2-242 | ARQ-M2-242 (Also known as TDM 242, TDM-2, 96-TDM, and ARQ-28) is a two-channel time division multiplexed telex system. This is the CCIR 242 standard version. Used in Aeronautical, Marine, and Point-to-Point services. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Worldwide |  |
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| ARQ-M2-342 | ARQ-M2-342 (Also known as TDM 342, TDM-2, 96-TDM, and ARQ-28) is a two-channel time division multiplexed telex system. This is the CCIR 342 standard version. Used in Aeronautical, Maritime, and Point-to-Point services. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Worldwide |  |
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| ARQ-M4-242 | ARQ-M4-242 (Also known as TDM 242, TDM-4, 192-TDM, and ARQ-56) is a four-channel time division multiplexed telex system. This is the CCIR 242 standard version. Used in Aeronautical, Maritime, and Point-to-Point services. | 3 MHz — 30 MHz | USB | FSK | 250 Hz | Worldwide |  |
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| ARQ-M4-342 | ARQ-M4-342 (Also known as TDM 342, TDM-4, 192-TDM, and ARQ-56) is a four-channel time division multiplexed telex system. This is the CCIR 342 standard version. Used in Aeronautical, Maritime, and Point-to-Point services. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Worldwide |  |
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| ARQ-N | ARQ-N is a synchronous dual channel ARQ mode identical to ARQ-E, with the only difference being that ARQ-N has no symbol inversions. Formerly used by Italian Diplomatic services. | 3 MHz — 30 MHz | USB | FSK | 85 Hz — 850 Hz | Worldwide |  |
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| ARQ6-90 | ARQ6-90, also known as ARQ-6-90 and ARQ-6/90, is a 6-character block simplex ARQ system formerly used by French and Italian diplomatic services exchange of teletype-data. It is no longer used or seen today. | 10 MHz — 23 MHz | USB | FSK | 700 Hz | Worldwide |  |
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| ARQ6-98 | ARQ6-98, also known as ARQ-6-98 and ARQ-6/98, is a 6-character block simplex ARQ system formerly used by French and Italian diplomatic services for the exchange of teletype-data. It is no longer used or seen today. | 10 MHz — 23 MHz | USB | FSK | 400 Hz | Worldwide |  |
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| ASCII | ASCII (also known as ITA5 or IRA) is an amateur radio telegraphy signal using the ITA-5 alphabet. | 3 MHz — 450 MHz | NFM, USB | FSK | 300 Hz | Worldwide |  |
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| AUTOSPEC | AUTOSPEC is a synchronous FEC teletype system used by British coastal stations to communicate with North Sea oil rigs. Also known as Autospec-bauer, Bauer, and Autospec Mk1. This signal is most likely phased out. | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Worldwide |  |
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| Amplitude Modulation (AM) | Long range commercial broadcast and international radio. Also used for aviation communications. | 153 kHz — 137 MHz | AM | AM | 10 kHz | Worldwide |  |
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| Amplitude Modulation Signalling System (AMSS) | Amplitude Modulation Signalling System (AMSS) is a DRM-based radiotext and data technology for AM broadcasting, like RDS that is used for FM. It transmits as a subcarrier, phase-modulating the carrier frequency. | 100 kHz — 30 MHz | SSB | AM (PSK) | 200 Hz |  |
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| Automatic Link Establishment (2G ALE) | Automatic Link Establishment, 2G ALE (Official designation MIL-STD-188-141A and/or MIL-STD-188-141B (Appendix A)) is the current standardized method of establishing connections between radio operators. Also known as FED-STD 1045, FED-STD 1049, and STANAG 5066. | 3.068 MHz — 28.313 MHz | USB | MFSK | 2 kHz | Worldwide |  |
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| Automatic Link Establishment (3G ALE ARCS) | 3G ALE (ARCS) is the next generation of ALE (Designated by MIL-STD-188-141B (Appendix C)). Also known as STANAG 4538, although MIL 188-141 does not provide Fast LSU. | 3 MHz — 30 MHz | USB | PSK | 3 kHz | Worldwide |  |
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| Automatic Link Set-up (ALIS) | Automatic Link Set-up (ALIS) is an automatic link system used by Rohde & Schwarz modems. | 3 MHz — 30 MHz | USB | FSK | 270 Hz | Worldwide |  |
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| BPM | BPM is a time signal transmitted by the Chinese Academy of Sciences, broadcasting from CAS's National Time Service Center in Pucheng County, China. | 2.5 MHz — 15 MHz | AM | AM | 3.5 kHz | China |  |
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| BR-6028 | BR-6028 is a VFT (Voice Frequency Telegraph) frequency and time diversity modem using 7 data channels. It is sometimes also known as BARRIE, USA-7, or 6028. | 5.75 MHz — 15.937 MHz | USB | FSK | 3.1 kHz | Worldwide |  |
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| CCIR 493-4 Selcall | CCIR 493-4 Selcall, also known as HF Selcall, Australian Selcall, and Codan 8580 Selcall, is a Selcall standard developed in Australia for the HF band. Used by Amateur radio and Codan Modems. | 3 MHz — 30 MHz | USB | FSK | 300 Hz | Worldwide |  |
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| CHIP | CHIP, or CHIP64, is a spread-spectrum PSK mode developed by Antonino Porcino IZ8BLY. | 7.09 MHz — 14.11 MHz | USB | PSK | 580 Hz | Worldwide |  |
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| CHU | CHU is a time signal radio station operated by the Institute for National Measurement Standards of the National Research Council of Canada. | 3.33 MHz — 14.67 MHz | USB | FSK, OOK | 2.25 kHz | Canada |  |
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| CIS 3x100 VFT | Three CIS-14 signals overlaid on top of each other in a 3100 Hz VFT bandwidth, operating at 100 bd | 3 MHz — 30 MHz | USB | FSK | 3.1 kHz | Russia |  |
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| CIS 3x144 VFT | Three 144 Bd FSK signals in a 3100 Hz VFT bandwidth. Reportedly phased out. | 3 MHz — 30 MHz | USB | FSK | 3.1 kHz | Russia |  |
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| CIS 3xBaudot-50 VFT | Three 50 bd Baudot signals in a 3100 Hz VFT bandwidth. | 3 MHz — 30 MHz | USB | FSK | 3.1 kHz | Russia |  |
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| CIS MFSK-16 XPA2 | Enigma Designation XPA2, also known as MFSK-16, CIS MFSK-14, and CIS MFSK-16, is a 14-tone MFSK signal said to have origin from Russian Intelligence and Foreign Ministry stations. | 3 MHz — 30 MHz | USB | MFSK | 250 Hz | Russia |  |
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| CIS MFSK-20 XPA | Enigma Designation XPA, also known as MFSK-20, CIS MFSK-17, and CIS MFSK-20, is a 17-tone MFSK signal said to have origin from Russian Intelligence and Foreign Ministry stations. | 3 MHz — 30 MHz | USB | MFSK | 800 Hz | Russia |  |
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| CIS MFSK-68 | New Russian MFSK Modem that uses 68 MFSK (5 tones at a time) as well as a 9000 Bd 8-PSK insert every second which spans 10 kHz wide. This signal is often found attributed with CIS-3000, where CIS-3000 acts as the ALE for this signal as well as CIS-128. | 7.659 MHz — 18.28 MHz | USB | MFSK, PSK | 10 kHz | Russia |  |
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| CIS OFDM HDR Modem | Russian OFDM HDR (High Data Rate) Modem. Has three main modes: CIS-45, CIS-60, and CIS-93, corresponding to the number of OFDM tones in the signal. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.8 kHz — 3 kHz | Russia |  |
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| CIS-11 | CIS-11 (Also known as TORG-11) is a radio duplex teleprinter system used by Russian meteorological stations | 3 MHz — 30 MHz | USB | FSK | 650 Hz | Russia |  |
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| CIS-112 | CIS-112 OFDM signal. Has a preamble of 7 Tones (not including carrier), then 56 tones before entering into the 112 tone data transmission. | 3 MHz — 30 MHz | USB | PSK, OFDM | 3 kHz | Russia |  |
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| CIS-12 | CIS-12 (Also known as MS5, FIRE, AT-3004D, or AT-3104D) is a 12-tone PSK Russian military multi-channel modem. | 7.026 MHz — 14.6 MHz | USB | PSK | 3.1 kHz | Russia |  |
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| CIS-128 | CIS-128 is an OFDM mode that uses 128 channels, with one “off” channel in the center, so the signal is divided into two 64 channel parts. | 3 MHz — 30 MHz | USB | PSK, OFDM, QAM | 3.1 kHz — 6.1 kHz | Russia |  |
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| CIS-1280 | CIS-1280 is a OQPSK (Offset Quadrature Phase Shift-Keying) modulation data modem signal. Also known as Soviet Mil(MOD)/FAPSI/PTT system. These stations are recognizable in that they are all placed on .081 offsets from a kilohertz or half kilohertz point. | 3 MHz — 13.369 MHz | USB | PSK | 1.28 kHz | Russia |  |
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| CIS-14 | Also known as AMOR and AMOR96. Synchronous FSK duplex teleprinter system with ARQ. | 3 MHz — 30 MHz | USB | FSK | 650 Hz | Russia |  |
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| CIS-16 | CIS-16 is a BPSK 16-tone mode, possibly transmitted from a modified AT-3004D or AT-3104 type Russian military transceiver. Also known as CIS 16x75 Bd for the 75 bd speed in each of the 16 sub channels. | 3 MHz — 30 MHz | USB | PSK | 2.7 kHz | Russia |  |
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| CIS-20 | Russian AT-3104 Modem signal, 20-tone OFDM DQPSK signal | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.75 kHz | Russia |  |
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| CIS-300 | Known as CIS-300 Burst, FSK mode used with 300 Bd rate with a starting and ending tone on the upper part of the signal. | 3 MHz — 30 MHz | USB | FSK | 370 Hz | Russia |  |
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| CIS-3000 | CIS-3000 is an 8-PSK Data Modem protocol. It's source is traced to Russia. 3000 is for its 3000 Baud speed (maximum speed is technically 9000 bps). | 3 MHz — 30 MHz | USB | PSK | 3.4 kHz | Russia |  |
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| CIS-36-50 | CIS-36-50, also known as BEE-36 and T-600, is an FSK modem used by the Russian Navy. | 3 MHz — 30 MHz | USB | FSK | 300 Hz — 550 Hz | Russia |  |
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| CIS-40.5 | CIS-40.5 (Also known as T-206) is an FSK signal used in Russian Military Communications Equipment. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Russia |  |
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| CIS-48 | CIS-48 is an interesting data mode with a unique format. It uses a 4 DBPSK Preamble with a constant tone and changing OFDM modes as it transmits data. Origin is suspected to be in Russia. | 5.017 MHz — 17.289 MHz | USB | PSK | 2 MHz — 3 MHz | Russia |  |
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| CIS-50-50 | CIS-50-50 is very similar to CIS-36-50. The main difference is in the available baud rates and frequency shifts used. | 3 MHz — 30 MHz | USB | FSK | 150 Hz — 630 Hz | Russia |  |
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| CIS-8181 | CIS-8181 is an FSK modem used by the Russian navy. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Russia |  |
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| CLOVER 2000 | CLOVER 2000 is an upgrade to CLOVER-II, a digital data protocol developed by Ray Petit and HAL Communications. Sometimes referred to as XCLOVER or 8 Tone CLOVER. | 3 MHz — 30 MHz | USB | PSK, QAM | 2 kHz | Worldwide |  |
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| CLOVER 2500 | CLOVER 2500 is a new upgrade to CLOVER-2000, adding 25% more speed to the CLOVER system. | 3 MHz — 30 MHz | USB | PSK, QAM | 2.5 kHz | Worldwide |  |
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| CLOVER-I | CLOVER-I was the first iteration of the Clover series of digital modes. Was never released for commercial use, replaced by CLOVER-II. Also known as Cloverleaf. | 3 MHz — 30 MHz | USB | PSK, QAM | 100 Hz | Worldwide |  |
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| CLOVER-II | CLOVER-II is the advancement of CLOVER-I, with 4 tone pulses and a max data rate of 750 bps. Also known as Q-CLOVER and QUAD-CLOVER. | 3 MHz — 30 MHz | USB | PSK, QAM | 500 Hz | Worldwide |  |
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| CODAR | CODAR (Coastal Ocean Dynamics Applications Radar) is used for near-surface ocean monitoring, such as waves and water current. | 4.438 MHz — 42.5 MHz | USB | ILFM | 50 kHz | Worldwide |  |
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| CRY2001 Voice Scrambler | CRY2001 is a voice scrambling mode used on Sailor CRY2001 Scramblers. Fisherman often use these modes to communicate with privacy. | 3 MHz — 300 MHz | USB | FSK | 3 kHz | Worldwide |  |
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| CV-786 | CV-786 is a wideband FSK mode built in Rockwell-Collins MDM-2001 modems. Also known as TRC-75, as it was used in TRC-75 transceivers. A military-based Radio TeleTYpe mode. | 3 MHz — 30 MHz | USB | FSK | 900 Hz | Worldwide |  |
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| Chinese 4+4 | Chinese 4+4, also known as 4+4 or PRC 4+4, is a multi-carrier transmission mode. It used by Chinese Diplomatic services with most traffic originating from Beijing, China. | 3 MHz — 30 MHz | USB | PSK | 2.5 kHz | China |  |
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| Chinese Firedrake Jammer | The Chinese Firedrake Jammer (also known as FireDragon) is a Commercial AM Broadcast jamming signal that aims to jam specific radio stations in Asia from being received by listeners. It plays the chinese folk song "The Firedrake" to jam AM radio stations. | 6 MHz — 18 MHz | AM | AM | 10 kHz | China |  |
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| Codan Data Modem | Codan Data Modulation for Codan Data Modems. Has 3 distinct signals: Data, ALE, and SELCAL. This modulation is used in Codan's 9001, 9002, 3012 and 3212 modems. | 3 MHz — 30 MHz | USB | PSK, FSK | 400 Hz — 2.56 kHz | Worldwide |  |
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| Coherent BPSK | Coherent BPSK, also known as C-BPSK, was an experimental amateur mode developed by Bill DeCarle VE2IQ. | 138 kHz — 18.081 MHz | USB | PSK | 200 Hz | Worldwide |  |
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| Coherent CW | Coherent CW (also known as CCW) was a strictly timed morse code mode designed by Ray Petit W7GHM (The same inventor of CLOVER). CCW depended on accurate timing from both receiver and transmitter. | 3 MHz — 30 MHz | USB | OOK | 1 Hz | Worldwide |  |
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| Contestia | Contestia, developed by Nick Fedoseev (UT2UZ) in 2005, is a digital mode derived from Olivia. It aims to deliver a compromise of speed and performance. | 3 MHz — 30 MHz | USB | MFSK | 150 Hz — 2 kHz | Worldwide |  |
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| Coquelet | Coquelet is an MFSK system, similar to Piccolo. Also known as COQ-8, COQ-12, and COQUELET 8 V 2. Uses ITA-2 charset. It's two main modes are Coquelet-8 and Coquelet-13. No longer in use. | 3 MHz — 30 MHz | USB | MFSK | 300 Hz — 500 Hz | Worldwide |  |
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| DUP-ARQ | DUP-ARQ, also known as ARTRAC and 125-ARTRAC, is a semi-duplex ARQ system once used by Thai and Hungarian Diplomatic services. | 3 MHz — 30 MHz | USB | FSK | 325 Hz | Worldwide |  |
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| DUP-ARQ-2 | DUP-ARQ-2 (also known as ARTRAC II) is a further development of the DUP-ARQ system and the system characteristics are very similar. DUP-ARQ-2 allows transmission of ITA-2 (Baudot) or ITA-5 (ASCII) characters depending on the application. | 3 MHz — 30 MHz | USB | FSK | 1.3 kHz | Worldwide |  |
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| DUP-FEC-2 | DUP-FEC-2 is a further development of the DUP-ARQ system and the system characteristics are very similar. Uses FEC instead of ARQ and runs at either 125 bd or 250 bd. | 3 MHz — 30 MHz | USB | FSK | 1.1 kHz | Worldwide |  |
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| Datawell Buoy HF Link | Datawell Buoy HF Links transmitted by Datawell Marine measurement buoys, measuring ocean conditions, temperature, and wave current. | 25.5 MHz — 45 MHz | USB | FSK, MFSK | 200 Hz — 400 Hz | Worldwide |  |
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| Digital Radio Mondiale (DRM) | Digital Radio Mondiale (DRM) is a digital commercial broadcasting mode used to deliver FM-comparable sound quality to shortwave radio. | 909 kHz — 26.06 MHz | USB | QAM, OFDM | 4.5 kHz — 20 kHz | Worldwide |  |
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| DominoEX | DominoEX, also known as just Domino, is an IFK (Incremental Frequency Keying) mode developed by Murray Greenman ZL1BPU and Con Wassilieff ZL2AFP in 2004 that was the first fully developed iteration of the Domino IFK family modes. Used to send text over RF. | 5.332 MHz — 28.117 MHz | USB | IFK | 173 Hz — 524 Hz | Worldwide |  |
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| DominoF | DominoF was the first experimental implementation of the Domino family of IFK modes, developed by Con ZL2AFP. DominoF used dual interleaved tone sets. Superseded by DominoEX. | 1.838 MHz — 28.08 MHz | USB | IFK | 220 Hz | Worldwide |  |
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| Eurobalise downlink | Downlink from train to balise | 27.095 MHz | AM | Europe |  |
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| FEC-A | FEC-A, also known as FEC-100 or FEC-100A, is a synchronous simplex ARQ system that uses the ITA 2 alphabet. This mode was once used by many embassies, diplomatic services, and news agencies worldwide. This mode was developed by Siemens. | 3 MHz — 30 MHz | USB | FSK | 100 Hz — 1.2 kHz | Worldwide |  |
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| FSQ | Fast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015. | 3.58 MHz — 10.149 MHz | USB | IFK+ | 300 Hz | Worldwide |  |
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| FT8 | FT8 is an amateur radio QSO communication protocol | USB | MFSK | 50 Hz | Worldwide |  |
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| FreeDV COHPSK | FreeDV Coherent PSK (Also known as FreeDV 700) is a robust Digital Voice mode developed by David Rowe for his FreeDV Digital Voice Software. | 3 MHz — 30 MHz | USB | PSK | 1.5 kHz | Worldwide |  |
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| Frequency Division Multiplex Digital Voice (FDMDV) | Frequency Division Multiplex Digital Voice (FDMDV), also known as FDMDV 14+1-tone, is a digital voice mode originally developed by Peter Martinez G3PLX and Francesca Lanza HB9TLK. It has since been improved upon by David Rowe. | 3 MHz — 30 MHz | USB | PSK | 1.125 kHz — 1.3 kHz | Worldwide |  |
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| G-TOR | Golay-Teleprinting Over Radio (G-TOR) is an FSK proprietary standard developed by Kantronics Inc. and is used by radio amateurs, military (Irish Air Corps/Navy, Mexican army) and governmental agencies (ICRC). | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Worldwide |  |
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| GM2100 (R&S) | Advanced HF waveform for data transmission. R&S proprietary. PSK8, 2400 sps. | 3 MHz — 30 MHz | USB | PSK | 3 kHz | Europe |  |
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| GMDSS Digital Selective Calling | Global Maritime Distress and Safety System's Digital Selective Calling (GMDSS-DSC) is a maritime communication protocol intended to initiate ship-to-ship, ship-to-shore and shore-to-ship radiotelephone and MF/HF radiotelex calls. | 2.177 MHz — 156.525 MHz | USB | FSK | 350 Hz | Worldwide |  |
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| Globe Wireless HF Network | Globe Wireless' Maritime Digital Radio was a system of 24 stations around the globe offering data services to large cargo vessels. Since 2014, GW has discontinued their HF network. | 3 MHz — 30 MHz | USB | PSK, FSK, OFDM | 400 Hz — 2 kHz | Worldwide |  |
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| HC-265 Voice Scrambler | HC-265 is a Voice Scrambling mode developed by Hagelin Crypto for their HC-265 CRYPTOCOM secure voice unit. | 3 MHz — 30 MHz | USB | FSK | 2.25 kHz — 3 kHz | Worldwide |  |
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| HC-ARQ | Haegelin Crypto ARQ (HC-ARQ) was an FSK synchronous simplex ARQ system used by the UN and International Rescue Committee. This mode has been phased out and is no longer in use. | 3 MHz — 30 MHz | USB | FSK | 300 Hz | Worldwide |  |
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| HFGCS (High Frequency Global Communications System) | HFGCS is a series of networks deployed by the United States Air Force to send encoded messages to deployed aircraft. This network is well known for it's coded EAM's (Emergency Action Messages) used for coordinating United States Strategic Nuclear Forces. | 4.724 MHz — 15.016 MHz | USB | USB | 2.95 kHz | Worldwide |  |
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| HNG-FEC | HNG-FEC was a full duplex system developed and used solely by the Ministry of Foreign Affairs in Hungary. Used 100.05 bd with 500 Hz shift FSK. This mode is no longer used today. | 2.4 MHz — 24 MHz | USB | FSK | 600 Hz | Hungary |  |
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| Hellschreiber | Hellschreiber (Also known as Feld Hell or just Hell) is a teleprinter system developed in the late 1920's by Rudolf Hell, a German inventor. | 3 MHz — 30 MHz | USB | OOK, FSK, MSK | 350 Hz — 800 Hz | Worldwide |  |
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| High Frequency Active Auroral Research Program (HAARP) | HAARP is a ionospheric research program conducted in Gakona, Alaska. | 2.7 MHz — 10 MHz | AM, CW | CW, FMCW | 100 kHz | United States |  |
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| High Frequency Data Link (HFDL) | HFDL, also known as HF-ACARS, ARINC 753, ARINC 635, and HF DATALINK,is a data link that aircraft use to communicate short messages over long distances using HF signals. | 2.9 MHz — 22 MHz | USB | PSK | 2.4 kHz | Worldwide |  |
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| High Frequency Data and Voice Link (HFDVL) | HFDVL (or HFD+VL) is an experimental mode developed by research groups from The University of Las Palmas de Gran Canaria and The Polytechnic University of Madrid. This mode is intended for military use in accordance with STANAG 5066 parameters. | 14.35 MHz — 14.829 MHz | USB | PSK, OFDM, QAM | 3 kHz | Spain |  |
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| High Power Auroral Stimulation (HIPAS) | 2.85 MHz — 4.53 MHz | United States | — |  |
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| ICAO Selcal | ICAO Selcal (also known as AVCALL, ANNEX 10, or just SELCAL) is a HF/VHF aviation selective calling system used by ground stations to initiate radio communications with aircraft. | 3 MHz — 300 MHz | USB | MFSK | 1.5 kHz | Worldwide |  |
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| IRA-ARQ | IRA-ARQ, also known as BULG-ASCII and ASCII-ARQ, is a high data rate ARQ FSK system used by Bulgarian, Slovakian, and Czech diplomatic stations. The maximum speed of this mode has been seen to reach 1200 bd. Not seen much much nowadays | 3 MHz — 30 MHz | USB | FSK | 650 Hz — 1.35 kHz | Worldwide |  |
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| Improved Automatic Link Set-up (ALIS-2) | ALIS-2, also known as RS-ARQ, RS ARQ 240, and MERLIN, is an improvement of the original ALIS system. ALIS-2 is used in the Rohde & Schwarz MERLIN modem. | 3 MHz — 30 MHz | USB | FSK | 2 kHz | Worldwide |  |
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| Ionosonde | An Ionosonde (Also known as a chirpsounder or ionospheric sounder) is a radar that examines the Ionosphere and monitors HF propagation conditions by sweeping the HF band and receiving the echoes. | 1 MHz — 40 MHz | USB | FMCW | 1 Hz | Worldwide |  |
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| Iranian Navy QPSK Modem | Iranian Navy QPSK Modem is a QPSK mode used by the Iranian Navy. It has gone through several versions. The current version (2015) is V2 and supports speeds of 468 Bd, 936 Bd, and 1872 Bd. | 8.046 MHz — 17.382 MHz | USB | PSK | 300 Hz — 2.85 kHz | Iran |  |
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| Israeli Intelligence VFT | Israeli Intelligence based FSK VFT. | 3 MHz — 30 MHz | USB | FSK | 3.1 kHz | Israel |  |
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| Israeli Navy Hybrid Modem (188-110 MOD) | The Israeli Naval Hybrid Modem is based on the MIL-STD-188-110 Serial Standard. Has characteristic preamble with 4/6 Tone and 18 QPSK parallel mode before 110 Serial transmission. Possible use as a broadcast transmitter for ships. Used by the Israeli Navy 4XZ station from Haifa. | 3 MHz — 30 MHz | USB | PSK | 2.75 kHz | Israel |  |
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| Israeli VFT | Israeli based VFT transmission, most likely used by Israeli government or military. | 3 MHz — 30 MHz | USB | FSK, PSK | 3.1 kHz | Israel |  |
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| JT65 | JT65 is an amateur radio QSO communication protocol developed by Joe Taylor, K1JT. JT65 has 3 submodes: JT65A, JT65B, and JT65C. The most popular submode of JT65 is JT65A. JT65 gets '65' from the 65 tones it uses. | 1.838 MHz — 50.276 MHz | USB | MFSK | 180 Hz — 710 Hz | Worldwide |  |
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| JT9 | JT9 is a very narrow 9-FSK mode for making contact (QSO's) under extreme weak-signal conditions. | 3.578 MHz — 28.079 MHz | USB | MFSK | 20 Hz | Worldwide |  |
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| JTMS | JTMS is a meteor scatter mode that uses MSK. JTMS behaves similarily to FSK441. | 3 MHz — 30 MHz | USB | MSK | 1.7 kHz | Worldwide |  |
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| Japan Military 8-Channel FSK | Data signal thought to originate from Japanese Military/Navy | 12.385 MHz — 16.554 MHz | USB | FSK | 2.4 kHz | Japan |  |
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| Japanese Slot Machine (XSL) | The Japanese Slot Machine (Enigma Designation XSL) is a simplex system used by the Japanese Maritime Self-Defense Force in Ichihara, Japan. | 4.153 MHz — 8.703 MHz | USB | PSK | 2 kHz | Japan |  |
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| Jindalee Operational Radar Network (JORN) | JORN is an Australian OTHR system that operates uniquely in that it's radar bursts include an intro tone before the burst. | 8.992 MHz — 22.95 MHz | USB | FMCW | 10 kHz | Australia |  |
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| KG-STV | KG-STV is an image transmission mode developed by JJ0OBZ in Japan. | 3.733 MHz — 14.233 MHz | USB | FSK | 500 Hz — 2.5 kHz | Worldwide |  |
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| Lentus | Lentus is an extremely slow QRP mode developed by Patrick Lindecker F6CTE used to transmit QRP's at very low power. Each 43-character (75 bit) transmission takes roughly 5 minutes to transmit across 32 possible tones in a tight 25 Hz bandwidth. | 136.3 kHz — 14.096 MHz | USB | MFSK | 25 Hz | Worldwide |  |
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| Link-11 | Link-11 (Also known as ALLIGATOR, STANAG 5511, TADIL-A, MIL-STD-6011, and MIL-STD-188-203-1A) is a Tactical Data Link standard (formerly known as Tactical Digital Information Link (TADIL) used by NATO and the US Military for Maritime Tactical Data Exchange. | 2 MHz — 30 MHz | USB | PSK | 2.5 kHz — 6 kHz | Worldwide |  |
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| MD-522 | MD-522 (Also known as MIL-M-55529A) is a synchronous FSK mode built into GRC-MD522 teletypewriter sets and used for wirelessly transmitting ASCII information. MD-522 has a narrowband, wideband, and diversity mode. | 3 MHz — 30 MHz | USB | FSK | 200 Hz — 300 Hz | United States |  |
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| MD-674 | MD-674, also known as Wireline FSK, is a very old United States Military FSK Modem from the 1960's. Uses 85 Hz FSK shift. Speeds of 50 Bd, 75 Bd, 100 Bd, and 150 Bd have been logged. No longer seen today. | 3 MHz — 30 MHz | USB | FSK | 200 Hz — 300 Hz | United States | |
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| MIL-STD-110-342 | MIL-STD-110-342 was a US Dept. of Defense standard for a 16 channel VFT teletype transmission. This mode was officially cancelled as of December 5th, 1995. | 3 MHz — 30 MHz | USB | FSK | 3.1 kHz | Worldwide |  |
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| MIL-STD-188-110 Appendix A 16-Tone | MIL-STD-188-110 Appendix A is a 16-tone OFDM PSK signal used to transmit data. As of 110C revision, this mode has been phased out. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.1 kHz | Worldwide |  |
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| MIL-STD-188-110 Appendix B 39-Tone | MIL-STD-188-110 Appendix B is a 39-tone OFDM DQPSK mode used to send data and voice. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.4 kHz | Worldwide |  |
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| MIL-STD-188-110 Serial | MIL-STD-188-110 Serial is a US Department of Defense standard for HF Communications, Serial PSK mode. Can transmit both data and voice with a range of interleaving and speed modes for optimal propagation. | 3 MHz — 30 MHz | USB | PSK | 2.75 kHz | Worldwide |  |
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| MSM-1250 Modem | MSM-1250 (Medium Speed Modem) is a 10 FSK-2 OFDM digital data protocol used by the stand-alone modem "SkyFax", used to transmit and receive faxes on HF. | 3 MHz — 30 MHz | USB | FSK | 2.4 kHz — 2.5 kHz | Worldwide |  |
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| MT63 | MT63 is a Orthogonal Frequency Division Multiplexed (OFDM) digital data mode aimed for use in high noise environments. | 3 MHz — 30 MHz | USB | OFDM, PSK | 500 Hz — 2 kHz | Worldwide |  |
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| Marconi Selenia 25-Tone Modem | The Marconi Selenia 25-Tone Modem is a military modem developed sometime around 2003 by Marconi Selenia Communications (Now Finmeccanica). It supports ECCM capability and transmits at a datarate of 2400bps. | 3 MHz — 30 MHz | USB | PSK, OFDM | 1.6 kHz | Worldwide |  |
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| Mazielka (X06) | Mazielka (X06) is a diplomatic selcall system used by the Russian Ministry of Foreign Affairs. Used to alert that a Serdolik transmission is going to occur soon, usually on a different frequency. | 4.963 MHz — 23.458 MHz | USB | MFSK | 200 Hz | Russia |  |
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| Modernised High Frequency Communications System (MHFCS) | The Modernised High Frequency Communications System (MHFCS) is an Australian Department of Defense HF System for their military communications network. Also known as AUS MIL ISB Modem, AUS MHFCS, and ADF HFCS. | 2.01 MHz — 27.478 MHz | USB | FSK | 400 Hz — 750 Hz | Australia |  |
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| Morse Code (CW) | CW Morse Code is the simplest form of transmission found virtually all over the RF bands for a variety of uses. The most common use of this is for Call-sign Beacons by both Amateur and Military operators. | 3 kHz — 250,000 MHz | CW | OOK | 1 Hz | Worldwide |  |
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| Multi Frequency Shift Keying (MFSK) | MFSK is a family of multi-frequency shift keying digital transmission modes. MFSK-8 and MFSK-16 are two well-known amateur radio modes. | 3 MHz — 30 MHz | USB | MFSK | 154 Hz — 630 Hz | Worldwide |  |
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| Multitone Paging | Multitone Paging signal, developed by Multitone Electronics in the UK. Uses similar coding to POCSAG but the headers are different and only work with Multitone's range of paging products | 25 MHz — 470 MHz | NFM | FFSK | 12.5 kHz — 25 kHz | Worldwide |  |
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| Nokia Adaptive Message Terminal | The Nokia Adaptive Message Terminal, also known as Nokia Adaptive Burst Modem and Kryapp 302, is a Finnish encrypted messaging system suggested to be used by Finnish Intelligence Services and Swedish Military. | 3 MHz — 30 MHz | USB | FSK | 1 kHz — 1.6 kHz | Worldwide |  |
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| North Korean Diplo FSK | North Korean Diplomatic FSK link, teletype radio diplomatic usage. Also known as DPRK-FSK, KRE-FSK, DPRK-ARQ, and KEGURI. Has a FEC stream mode and a burst ARQ mode. | 9 MHz — 29 MHz | USB | FSK | 1.2 kHz — 1.4 kHz | North Korea |  |
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| North Korean Diplo PSK | North Korean Diplomatic PSK link. Also known as KRE-PSK. Four speed modes have been seen, 150 bd, 300 bd, 600 bd, and 1200 bd. All use BPSK modulation. The main identifying feature of this signal are the preambles and end of transmission patterns. | 9 MHz — 29 MHz | USB | PSK | 300 Hz — 2.4 kHz | North Korea |  |
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| Olivia | OLIVIA is an amateur digital teletype mode designed by Pawel Jalocha SP9VRC in 2005. It's goal was to be effective even in poor propagation conditions. | 3 MHz — 30 MHz | USB | MFSK | 125 Hz — 2 kHz | Worldwide |  |
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| PACKET | PACKET, also known as FSK300, AX25, and X25, is a packet based protocol derived from AX.25 and HDLC computer network protocols. Packet radio is a synchronous system in which data is transmitted in ASCII character packets. | 3 MHz — 800 MHz | USB | FSK | 730 Hz | Worldwide |  |
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| PACTOR I | PACTOR-I is a digital data protocol combining elements of PACKET and AMTOR ARQ. | 3 MHz — 30 MHz | USB | FSK | 300 Hz | Worldwide |  |
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| PACTOR II | PACTOR II is an advancement of PACTOR I. It is up to 8 times faster than PACTOR I. | 3 MHz — 30 MHz | USB | PSK | 450 Hz | Worldwide |  |
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| PACTOR III | PACTOR III introduces 6 speed levels that provide higher throughput and improved robustness compared to PACTOR I and II. PACTOR III is on average 3.5 times faster than PACTOR II. With optimal conditions, PACTOR III becomes over 5 times faster. | 3 MHz — 30 MHz | USB | PSK | 400 Hz — 2.4 kHz | Worldwide |  |
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| PACTOR IV | PACTOR IV is the newest iteration of the PACTOR series, advancing from PACTOR I-III. It is 1.5x-3x faster than PACTOR III, and has 10 speed levels. | 3 MHz — 30 MHz | USB | PSK, QAM | 300 Hz — 2.4 kHz | Worldwide |  |
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| PAX | PAX and PAX2 are developed by Patrick Lindecker F6CTE in 2005, and was derived from Olivia. It utilizes the AX.25 protocol that PACKET uses, and had a minimum SNR of -10dB. Can transmit APRS frames. | 3.59 MHz — 144.62 MHz | USB | MFSK | 500 Hz | Worldwide |  |
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| PLUTO II OTH Radar | PLUTO II is an Over The Horizon Radar located in the Sovereign Base Area just outside RAF Akrotiri in Cyprus. PLUTO II is very active in Europe. | 8 MHz — 38 MHz | USB | FMCW | 20 kHz | Cyprus |  |
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| POCSAG | POCSAG (Post Office Code Standardisation Advisory Group), also known as Super-POCSAG, Radio Paging Code No. 1 or RPC1, is a one-way 2FSK paging protocol that supports 512, 1200, and 2400 bps. | 25 MHz — 932 MHz | NFM | FSK | 9 kHz | Worldwide |  |
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| POL-ARQ | POL-ARQ was a duplex ARQ system used by Polish and Italian diplomatic services. This system uses the CCIR 476-4 alphabet with polatiry retained. No longer in use. | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Europe |  |
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| PRC-16 | PRC-16 is a Chinese sourced PSK data link, traced to Shanghai. Suspected user Chinese Military. | 14.3 MHz | USB | PSK, OFDM | 2.2 kHz | China |  |
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| PSK-AM | PSK-AM is an amateur digital mode developed by Patrick Lindecker F6CTE in 2002/2003, and incorporates FEC interleaving. PSK-AM uses the modulation of PSK10/31 with the FEC of SITOR-B. | 10.148 MHz — 144.62 MHz | USB | PSK | 40 Hz — 180 Hz | Worldwide |  |
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| Panther-H Modem | Panther-H is an intelligent frequency hopping transceiver developed by Racal (now Thales Group). Has a signature 8-burst SOC (Start Of Conversation) sync procedure. Used in Panther-2000H radios | 1.5 MHz — 30 MHz | USB | PSK | 3 kHz | Worldwide |  |
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| Phase Shift Keying (PSK) | PSK is a digital teletype mode based on Phase-Shift Keying (PSK) modulation. The most popular amateur radio PSK mode is PSK 31. | 1.838 MHz — 909 MHz | USB | PSK | 10 Hz — 1 kHz | Worldwide |  |
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| Piccolo | Piccolo was a MFSK system developed by the UK Foreign and Commonwealth Office (FCO) to communicate with foreign embassies and UK military stations around the world. No longer used. | 3 MHz — 30 MHz | USB | MFSK | 180 Hz — 300 Hz | Worldwide |  |
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| Polish Intelligence 100bd 625Hz FSK | One-way broadcast system, used by one of Polish intelligence agencies for delivery of messages to their operatives abroad on fixed schedules. | 4 MHz — 20 MHz | USB | FSK | 3.5 kHz | Poland |  |
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| Pulse Coded Modulated (PCM) RC Toy | Signal used for remote control (RC) Toys. | 27.145 MHz — 49 MHz | PCM | Worldwide |  |
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| Q-MAC HF Modem | The Q-MAC HF Modem is a military modem developed by Q-MAC (acquired by Barrett Communications). It uses OFDM with a BPSK sync channel in a gap of the signal. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2 kHz | Worldwide |  |
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| Q15X25 | Q15X25, also known as NEWQPSK, is an experimental amateur radio packet modem developed by Pawel Jalocha SP9VRC. Q15X25 is a OFDM QPSK implementation of the AX.25 Packet protocol used in PACKET. | 3.585 MHz — 14.109 MHz | USB | PSK, OFDM | 1.95 kHz — 2.35 kHz | Worldwide |  |
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| RAC-ARQ | RAC-ARQ, also known as MEROD and RACAL-ARQ, is a teleprinter system by Racal, used in MEROD devices. MEROD stands for Message Entry and Read Out Device. Hasn't been seen since 2010. | 3 MHz — 30 MHz | USB | FSK | 1 kHz — 1.3 kHz | Worldwide |  |
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| ROS | ROS is an amateur radio teletype free running QSO mode designed for low signal/high noise conditions. | 1.8 MHz — 30 MHz | USB | CDMA, Phase Continious MFSK | 2 kHz | Worldwide |  |
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| RTTYM | RTTYM, developed by Nick Fedoseev (UT2UZ) in 2005, is a digital mode derived from Olivia. It aims to deliver a compromise of speed and performance. RTTYM is about 4x faster than Olivia, but trades the speed for reduced robustness and sensitivity. | 3 MHz — 30 MHz | USB | MFSK | 150 Hz — 2 kHz | Worldwide |  |
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| RUM-FEC | RUM-FEC, also known as ROU-FEC and SAU-FEC, is a FSK FEC system used by Romanian diplomatic services. This is no longer used today, replaced by MIL-STD 188-110 Serial. | 3 MHz — 30 MHz | USB | FSK | 750 Hz | Romania |  |
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| RUM-MOI FEC | RUM-MOI FEC, also known as RUM-MIL 115.76 Bd, is a FSK FEC mode used by the Romanian Ministry of Internal Affairs, supposedly under military use. This is no longer used today, replaced by MIL-STD 188-110 Serial. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Romania |  |
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| RWM | RWM is a Russian shortwave time signal station. | 4.996 MHz — 14.996 MHz | USB | OOK | 5 Hz | Russia |  |
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| Radio Teletype (RTTY) | RTTY (Also known as Baudot or ITA2) uses the Baudot 5-bit alphabet with FSK to send text messages over the shortwave. This mode is gradually dying out in favor of more robust modes like PSK31 in the amateur service. | 147.3 kHz — 28.15 MHz | USB | FSK | 85 Hz — 850 Hz | Worldwide |  |
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| Redundant Digital File Transfer (RDFT) | RDFT is an amateur radio digital mode used to transmit files. | 9.065 MHz — 9.24 MHz | USB | PSK | 1.8 kHz | Worldwide |  |
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| Rezonans-N type radar | This is radar working about 10 seconds per hour every day on different frequencies. | 3 MHz — 24 MHz | USB | FMOP | 20 kHz — 40 kHz | Russia |  |
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| Robust PACKET | Robust PACKET, also known as HF-APRS, RPR, Winlink RMS, and APRSlink, is an OFDM version of the amateur mode PACKET which is optimized for shortwave use. This mode was developed by Spezielle Communications Systeme GmbH & Co. KG (SCS). | 3.61 MHz — 14.103 MHz | USB | PSK, OFDM | 500 Hz | Worldwide |  |
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| Russian Diplo VFT PSK 64Bd | Russian Diplomatic 3 channel VFT PSK running at 64 Bd. Enigma M42 designation | 4.022 MHz — 23.131 MHz | USB | PSK | 2.5 kHz | Russia |  |
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| Russian Intelligence 200bd 1000Hz FSK | One-way error-correcting broadcast system, used by one of Russian intelligence agencies for delivery of messages to their operatives abroad on fixed schedules. | 4 MHz — 23 MHz | USB | FSK | 1 kHz | Russia |  |
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| SI-ARQ | SI-ARQ, also known as ARQ-S and ARQ-1000S, is a simplex ARQ system designed by Siemens formerly used by Austrian and Indonesian diplomatic services. No longer used today. | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Europe |  |
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| SI-FEC | SI-FEC, also known as FEC-S, FEC 1000 Simplex, and FEC-1000S, was the FEC variant of SI-ARQ, and was only used under extremely poor propagation conditions. SI-FEC was developed by Siemens and was used by Austrian and Indonesian diplomatic services. | 3 MHz — 30 MHz | USB | FSK | 280 Hz | Europe |  |
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| SITOR-A | SITOR-A (Also known as AMTOR-A) is one of two modes of SITOR, which stands for Simplex Teletype Over Radio. | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Worldwide |  |
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| SITOR-B | SITOR-B is one of two modes of SITOR (Simplex Teletype Over Radio). | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Worldwide |  |
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| SP-14 (XP) | SP-14 (XP) was a 14 tone MFSK mode with origins from the Russian Intelligence and Foreign Ministry. Also known as NUM-13. Inactive since 2005, superseded by XPA. | 9 MHz — 12 MHz | AM | MFSK | 1.2 kHz | Russia |  |
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| SPREAD | SPREAD, also known as AUTOSPEC Mk2, SPREAD-11, SPREAD-21, and SPREAD-51, was a FEC system used by Romanian diplomatic stations and the Brazilian Navy and shore stations. SPREAD is considered the successor to AUTOSPEC. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Worldwide |  |
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| STANAG 4197 | STANAG 4197 is a NATO QPSK OFDM signal used in ANDVT modems that transmit encrypted digital voice over HF. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.3 kHz | Worldwide |  |
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| STANAG 4285 | STANAG 4285 is specified by the NATO (North Atlantic Treaty Organization) Military Agency for Standardization in "Characteristics of 1200 / 2400 / 3600 Bits per Second Single Tone Modulators / Demodulators for HF Radio Links" | 1.89 MHz — 22.7 MHz | USB | PSK | 2.75 kHz | Worldwide |  |
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| STANAG 4415 | STANAG 4415 is a NATO standard for robust, non-hopping digital data communication, used on severely degraded HF channels with large Doppler and multipath spreads. | 3 MHz — 30 MHz | USB | PSK | 2.75 kHz | Worldwide |  |
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| STANAG 4481 | STANAG 4481, also known as CRATT, Link-4, and NATO-75, is specified by the NATO (North Atlantic Treaty Organization) Military Agency for Standardization as a "Minimum technical equipment standards for naval HF shore-to-ship broadcast system" | 2.815 MHz — 18.016 MHz | USB | FSK, PSK | 1.5 kHz — 2.75 kHz | Worldwide |  |
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| STANAG 4529 | STANAG 4529 a modification of STANAG 4285 to deliver data and voice in 1240 Hz of bandwidth at rates of up to 1800 bps. | 3 MHz — 30 MHz | USB | PSK | 1.24 kHz | Worldwide |  |
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| STANAG 4539 | STANAG 4539 or MIL-STD-188-110B/C Appendix C is a HDR (110B) / MDR (110C) serial PSK/QAM signal that can reach speeds up to 9600 bps (128000 bps with no interleaving). | 3 MHz — 30 MHz | USB | PSK, QAM | 3 kHz | Worldwide |  |
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| SWED-ARQ | SWED-ARQ, also known as ARQ-SWE, was a Swedish simplex ARQ system used by Swedish diplomatic services. This protocol supported three packet lengths and was able to change packet length mid-transmission. No longer used today. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Sweden |  |
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| Saab Grintek MHF-50 MFSK Modem | The MHF-50 MFSK Modem by Saab Grintek Technologies in South Africa is a data modem that utilizes RTTY, 2-FSK, and 33-MFSK to transmit data | 4.245 MHz — 12.982 MHz | USB | MFSK, FSK | 2.2 kHz | South Africa |  |
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| Serdolik | Serdolik is a MFSK signal used by the Russian diplomatic service. | 3 MHz — 30 MHz | USB | MFSK | 1.4 kHz | Russia |  |
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| Siemens CHX-200 FSK Modem | CHX200, also known as Siemens CHP200 and PRC-921/GY, is a backpack HF ECCOM transceiver, designed and built by Siemens. | 1.5 MHz — 30 MHz | USB | FSK | 300 Hz | Worldwide |  |
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| Single Sideband Voice | Single side band, either lower side band or upper side band, is an AM modulated voice channel with one sideband suppressed. Used in the HF band by radio-amateurs and aircraft weather reports. | 3 MHz — 30 MHz | SSB | AM | 1.9 kHz | Worldwide |  |
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| Slow-Scan Television (SSTV) | Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images. | 3 MHz — 300 MHz | USB | FM | 2.5 kHz | Worldwide |  |
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| SuperDARN (Super Dual Auroral Radar Network) | SuperDARN is an international radar network used for scientific purposes. They are used to track and study all sorts of atmospheric phenomena. | 10 MHz — 12 MHz | 6 kHz | Worldwide |  |
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| T-230-1A 'Mahovik' | Mahovik, "Flywheel" in Russian, is a PSK based mode that can transmit both voice and data. It is transmitted from a Russian T-230-1A radio transceiver. | 3 MHz — 30 MHz | USB | PSK | 2.5 kHz | Russia |  |
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| THOR | THOR is an adaptation of DominoEX with MFSK16 binary varicode and FEC. | 3 MHz — 30 MHz | USB | IFK | 173 Hz — 524 Hz | Worldwide |  |
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| THROB | THROB is a unique data mode that relies heavily on DSP techniques, using MFSK and AM modulation techniques together. | 3 MHz — 30 MHz | USB | MFSK | 72 Hz — 188 Hz | Worldwide |  |
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| TT2300 | TT2300, also known as TT2300B, TT2300-ARQ, TRA-2300, and TPLEX, is an 8MFSK synchronous system developed by Thrane & Thrane of Denmark (acquired by UK defense firm Cobham in 2012). | 5.029 MHz — 7.72 MHz | USB | MFSK | 1.6 kHz — 1.7 kHz | Worldwide |  |
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| TWINPLEX | TWINPLEX, also known as F7B4 and TWINPLEX-SITOR, was a diplex 4-FSK ARQ mode developed by Mackay Radio and Telegraph Company, based in New York City, in the early 1950's. TWINPLEX was used by Interpol, the United Nations, and other diplomatic services. | 3 MHz — 30 MHz | USB | MFSK | 450 Hz — 950 Hz | Worldwide |  |
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| Thales SALAMANDRE (HFXL) | Thales SALAMANDRE (using HFXL waveform) uses up to 16 separate contiguous or not-contiguous narrowband HF channels for high datarate military and tactical communications. Operates on a modified STANAG-4539 platform. | 3 MHz — 30 MHz | USB | PSK | 150 kHz | Worldwide |  |
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| Thales Système 3000 HF Modem | Thales Système 3000 is a HF modem capable of many different modes of transmission. It has a unique preamble and format to it's signals. | 1.5 MHz — 30 MHz | USB | PSK, MFSK | 2 kHz — 3 kHz | Worldwide |  |
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| Thales Système 3000 Skyhopper | Thales Système 3000 Skyhopper is the frequency hopping mode of the Système 3000 Modem. Characterized by it's very short bursts and frequency hopping behavior. | 1.5 MHz — 30 MHz | USB | PSK, MFSK | 2 kHz — 2.6 kHz | Worldwide |  |
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| Thales Système 3000 Voice Scrambler | Voice Scrambling mode from Thales Système 3000 HF Modem. Has characteristic PSK and MFSK bursts at the beginning and end of a voice transmission. | 1.5 MHz — 30 MHz | USB | PSK, MFSK | 3 kHz | Worldwide |  |
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| The Goose | Channel marker of the Russian military station nicknamed "The Goose", for its distinct channel marker sound. Uses 3012kHz in nighttime, and 6360kHz in daytime. | 3.012 MHz — 6.36 MHz | USB | AM | 3.1 kHz | Russia |  |
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| UK GOV MIL WINDRM51 | UK GOV/MIL "WinDRM51" variant. Unknown purpose, But link between UK & Cyprus has been found some years ago. | 9.104 MHz — 13.451 MHz | USB | OFDM | 2.5 kHz | Europe |  |
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| UTC (Coordinated Universal Time) Time Standard | UTC (Coordinated Universal Time) time standard transmission from NIST (National Institute of Standards and Technology) stations WWV in Fort Collins, Colorado USA and WWVH in Kauai, Hawaii. | 2.5 MHz — 25 MHz | AM | 4 kHz | United States |  |
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| VEZHA-S | Two-way 100 Bd/500 Hz Russian Telegraph system, attributed name VEZHA-C (Tower-S), usage claimed to be by Russian Ministry of Communications (MinComSvyaz Rossii). Possible usage in meteorology under callsign RWD59. | 2.755 MHz — 12.165 MHz | USB | FSK | 650 Hz | Russia |  |
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| VISEL | VISEL, also known as YUG-MIL 120.9 Bd, FEC-12, and YUG-MIL FEC, is a synchronous teleprinter system used by the former Yugoslav military. No longer active today. | 3 MHz — 30 MHz | USB | FSK | 400 Hz | Europe |  |
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| VOICE | VOICE is a MFSK mode developed by Patrick Lindecker F6CTE in 2006, and was derived from Olivia. It was designed for blind or partially sighted amateur radio operators. | 3 MHz — 30 MHz | USB | MFSK | 200 Hz | Worldwide |  |
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| WEFAX | Radiofax (Also known as Weatherfax, HF-FAX, WEFAX, and Weather Facsimile) is a slow scan analog image transmission mode used for the transmission of press images, weather charts, newspapers, and meteorological reports. | 3 MHz — 30 MHz | USB | FM | 3 kHz | Worldwide |  |
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| WSPR | Weak Signal Propagation Reporter. | 136 kHz — 1,296.5 MHz | USB | MFSK | 6 Hz | Worldwide |  |
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| WinDRM | WinDRM is an amateur radio derivation of the Digital Radio Mondiale (DRM) digital voice and data transmission protocol. Also known as HamDRM, and Digital SSTV. | 14.236 MHz | USB | QAM, OFDM | 2.2 kHz — 2.4 kHz | Worldwide |  |
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| Yachta T-219 Voice Scrambler | Yachta or Yakhta (Russian for 'Boat') T-219 is an analogue voice scrambler. It is unique in that an FSK sync signal is transmitted in the middle of the main signal, with the scrambled voice stream split above and below the FSK signal. | 3 MHz — 30 MHz | USB | FSK | 2.7 kHz | Russia |  |
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| Yugoslavian 16-Tone Modem | The Yugoslavian 16-Tone Modem, also known as YUG-Diplo 16-Tone, is a 16 tone OFDM PSK modem used in former Yugoslavia for diplomatic use. No longer used today. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.1 kHz | Europe |  |
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| Yugoslavian 20-Tone Modem | The Yugoslavian 20-Tone Modem, also known as YUG-MIL 20-Tone and YUG Diplo 20-Tone, is a 20 tone OFDM PSK modem used in former Yugoslavia for military and diplomatic use. No longer used today. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.2 kHz | Europe |  |
| Inactive (No longer in use) |
Active (Currently in active use) |
Status Unknown or Intermittent |
| Signal Name | Description | Frequency | Mode | Modulation | Bandwidth | Location | Sample Audio | Waterfall image |
|---|---|---|---|---|---|---|---|---|
| 'Ghadir' OTH Radar | 'Ghadir', is an Iranian over the horizon radar, part of Iran's Sepehr Phased Radar System. | 28 MHz — 29.7 MHz | AM | Pulse | 60 kHz — 1 MHz | Iran | |
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| 29B6 'Kontayner' OTH Radar | 29B6, nicknamed 'Kontayner', is a Russian over the horizon radar. It is currently very active in Europe. | 6.1 MHz — 32 MHz | USB | FMOP | 3.5 kHz — 28 kHz | Russia | |
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| ALE-400 | ALE-400 is an amateur version of the 2G ALE standard. It is adapted to the demands of amateur radio emergency traffic handling. | 1.806 MHz — 144.163 MHz | USB | MFSK | 400 Hz | Worldwide | |
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| ARQ-E(E3) | ARQ-E, also known as ARQ-1000 Duplex or ARQ-1000D, is a synchronous full-duplex ARQ system. ARQ-E3 is a variant that uses a different alphabet encoding. Mainly used by French Military Forces. Stations commonly idled for hours on end. | 3 MHz — 30 MHz | USB | FSK | 85 Hz — 850 Hz | Worldwide | |
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| ARQ-M2-242 | ARQ-M2-242 (Also known as TDM 242, TDM-2, 96-TDM, and ARQ-28) is a two-channel time division multiplexed telex system. This is the CCIR 242 standard version. Used in Aeronautical, Marine, and Point-to-Point services. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Worldwide | |
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| ARQ-M2-342 | ARQ-M2-342 (Also known as TDM 342, TDM-2, 96-TDM, and ARQ-28) is a two-channel time division multiplexed telex system. This is the CCIR 342 standard version. Used in Aeronautical, Maritime, and Point-to-Point services. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Worldwide | |
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| ARQ-M4-242 | ARQ-M4-242 (Also known as TDM 242, TDM-4, 192-TDM, and ARQ-56) is a four-channel time division multiplexed telex system. This is the CCIR 242 standard version. Used in Aeronautical, Maritime, and Point-to-Point services. | 3 MHz — 30 MHz | USB | FSK | 250 Hz | Worldwide | |
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| ARQ-M4-342 | ARQ-M4-342 (Also known as TDM 342, TDM-4, 192-TDM, and ARQ-56) is a four-channel time division multiplexed telex system. This is the CCIR 342 standard version. Used in Aeronautical, Maritime, and Point-to-Point services. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Worldwide | |
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| ARQ-N | ARQ-N is a synchronous dual channel ARQ mode identical to ARQ-E, with the only difference being that ARQ-N has no symbol inversions. Formerly used by Italian Diplomatic services. | 3 MHz — 30 MHz | USB | FSK | 85 Hz — 850 Hz | Worldwide | |
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| ARQ6-90 | ARQ6-90, also known as ARQ-6-90 and ARQ-6/90, is a 6-character block simplex ARQ system formerly used by French and Italian diplomatic services exchange of teletype-data. It is no longer used or seen today. | 10 MHz — 23 MHz | USB | FSK | 700 Hz | Worldwide | |
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| ARQ6-98 | ARQ6-98, also known as ARQ-6-98 and ARQ-6/98, is a 6-character block simplex ARQ system formerly used by French and Italian diplomatic services for the exchange of teletype-data. It is no longer used or seen today. | 10 MHz — 23 MHz | USB | FSK | 400 Hz | Worldwide | |
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| ASCII | ASCII (also known as ITA5 or IRA) is an amateur radio telegraphy signal using the ITA-5 alphabet. | 3 MHz — 450 MHz | NFM, USB | FSK | 300 Hz | Worldwide | |
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| AUTOSPEC | AUTOSPEC is a synchronous FEC teletype system used by British coastal stations to communicate with North Sea oil rigs. Also known as Autospec-bauer, Bauer, and Autospec Mk1. This signal is most likely phased out. | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Worldwide | |
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| Amplitude Modulation (AM) | Long range commercial broadcast and international radio. Also used for aviation communications. | 153 kHz — 137 MHz | AM | AM | 10 kHz | Worldwide | |
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| Amplitude Modulation Signalling System (AMSS) | Amplitude Modulation Signalling System (AMSS) is a DRM-based radiotext and data technology for AM broadcasting, like RDS that is used for FM. It transmits as a subcarrier, phase-modulating the carrier frequency. | 100 kHz — 30 MHz | SSB | AM (PSK) | 200 Hz | |
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| Automatic Link Establishment (2G ALE) | Automatic Link Establishment, 2G ALE (Official designation MIL-STD-188-141A and/or MIL-STD-188-141B (Appendix A)) is the current standardized method of establishing connections between radio operators. Also known as FED-STD 1045, FED-STD 1049, and STANAG 5066. | 3.068 MHz — 28.313 MHz | USB | MFSK | 2 kHz | Worldwide | |
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| Automatic Link Establishment (3G ALE ARCS) | 3G ALE (ARCS) is the next generation of ALE (Designated by MIL-STD-188-141B (Appendix C)). Also known as STANAG 4538, although MIL 188-141 does not provide Fast LSU. | 3 MHz — 30 MHz | USB | PSK | 3 kHz | Worldwide | |
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| Automatic Link Set-up (ALIS) | Automatic Link Set-up (ALIS) is an automatic link system used by Rohde & Schwarz modems. | 3 MHz — 30 MHz | USB | FSK | 270 Hz | Worldwide | |
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| BPM | BPM is a time signal transmitted by the Chinese Academy of Sciences, broadcasting from CAS's National Time Service Center in Pucheng County, China. | 2.5 MHz — 15 MHz | AM | AM | 3.5 kHz | China | |
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| BR-6028 | BR-6028 is a VFT (Voice Frequency Telegraph) frequency and time diversity modem using 7 data channels. It is sometimes also known as BARRIE, USA-7, or 6028. | 5.75 MHz — 15.937 MHz | USB | FSK | 3.1 kHz | Worldwide | |
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| CCIR 493-4 Selcall | CCIR 493-4 Selcall, also known as HF Selcall, Australian Selcall, and Codan 8580 Selcall, is a Selcall standard developed in Australia for the HF band. Used by Amateur radio and Codan Modems. | 3 MHz — 30 MHz | USB | FSK | 300 Hz | Worldwide | |
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| CHIP | CHIP, or CHIP64, is a spread-spectrum PSK mode developed by Antonino Porcino IZ8BLY. | 7.09 MHz — 14.11 MHz | USB | PSK | 580 Hz | Worldwide | |
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| CHU | CHU is a time signal radio station operated by the Institute for National Measurement Standards of the National Research Council of Canada. | 3.33 MHz — 14.67 MHz | USB | FSK, OOK | 2.25 kHz | Canada | |
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| CIS 3x100 VFT | Three CIS-14 signals overlaid on top of each other in a 3100 Hz VFT bandwidth, operating at 100 bd | 3 MHz — 30 MHz | USB | FSK | 3.1 kHz | Russia | |
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| CIS 3x144 VFT | Three 144 Bd FSK signals in a 3100 Hz VFT bandwidth. Reportedly phased out. | 3 MHz — 30 MHz | USB | FSK | 3.1 kHz | Russia | |
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| CIS 3xBaudot-50 VFT | Three 50 bd Baudot signals in a 3100 Hz VFT bandwidth. | 3 MHz — 30 MHz | USB | FSK | 3.1 kHz | Russia | |
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| CIS MFSK-16 XPA2 | Enigma Designation XPA2, also known as MFSK-16, CIS MFSK-14, and CIS MFSK-16, is a 14-tone MFSK signal said to have origin from Russian Intelligence and Foreign Ministry stations. | 3 MHz — 30 MHz | USB | MFSK | 250 Hz | Russia | |
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| CIS MFSK-20 XPA | Enigma Designation XPA, also known as MFSK-20, CIS MFSK-17, and CIS MFSK-20, is a 17-tone MFSK signal said to have origin from Russian Intelligence and Foreign Ministry stations. | 3 MHz — 30 MHz | USB | MFSK | 800 Hz | Russia | |
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| CIS MFSK-68 | New Russian MFSK Modem that uses 68 MFSK (5 tones at a time) as well as a 9000 Bd 8-PSK insert every second which spans 10 kHz wide. This signal is often found attributed with CIS-3000, where CIS-3000 acts as the ALE for this signal as well as CIS-128. | 7.659 MHz — 18.28 MHz | USB | MFSK, PSK | 10 kHz | Russia | |
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| CIS OFDM HDR Modem | Russian OFDM HDR (High Data Rate) Modem. Has three main modes: CIS-45, CIS-60, and CIS-93, corresponding to the number of OFDM tones in the signal. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.8 kHz — 3 kHz | Russia | |
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| CIS-11 | CIS-11 (Also known as TORG-11) is a radio duplex teleprinter system used by Russian meteorological stations | 3 MHz — 30 MHz | USB | FSK | 650 Hz | Russia | |
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| CIS-112 | CIS-112 OFDM signal. Has a preamble of 7 Tones (not including carrier), then 56 tones before entering into the 112 tone data transmission. | 3 MHz — 30 MHz | USB | PSK, OFDM | 3 kHz | Russia | |
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| CIS-12 | CIS-12 (Also known as MS5, FIRE, AT-3004D, or AT-3104D) is a 12-tone PSK Russian military multi-channel modem. | 7.026 MHz — 14.6 MHz | USB | PSK | 3.1 kHz | Russia | |
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| CIS-128 | CIS-128 is an OFDM mode that uses 128 channels, with one “off” channel in the center, so the signal is divided into two 64 channel parts. | 3 MHz — 30 MHz | USB | PSK, OFDM, QAM | 3.1 kHz — 6.1 kHz | Russia | |
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| CIS-1280 | CIS-1280 is a OQPSK (Offset Quadrature Phase Shift-Keying) modulation data modem signal. Also known as Soviet Mil(MOD)/FAPSI/PTT system. These stations are recognizable in that they are all placed on .081 offsets from a kilohertz or half kilohertz point. | 3 MHz — 13.369 MHz | USB | PSK | 1.28 kHz | Russia | |
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| CIS-14 | Also known as AMOR and AMOR96. Synchronous FSK duplex teleprinter system with ARQ. | 3 MHz — 30 MHz | USB | FSK | 650 Hz | Russia | |
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| CIS-16 | CIS-16 is a BPSK 16-tone mode, possibly transmitted from a modified AT-3004D or AT-3104 type Russian military transceiver. Also known as CIS 16x75 Bd for the 75 bd speed in each of the 16 sub channels. | 3 MHz — 30 MHz | USB | PSK | 2.7 kHz | Russia | |
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| CIS-20 | Russian AT-3104 Modem signal, 20-tone OFDM DQPSK signal | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.75 kHz | Russia | |
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| CIS-300 | Known as CIS-300 Burst, FSK mode used with 300 Bd rate with a starting and ending tone on the upper part of the signal. | 3 MHz — 30 MHz | USB | FSK | 370 Hz | Russia | |
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| CIS-3000 | CIS-3000 is an 8-PSK Data Modem protocol. It's source is traced to Russia. 3000 is for its 3000 Baud speed (maximum speed is technically 9000 bps). | 3 MHz — 30 MHz | USB | PSK | 3.4 kHz | Russia | |
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| CIS-36-50 | CIS-36-50, also known as BEE-36 and T-600, is an FSK modem used by the Russian Navy. | 3 MHz — 30 MHz | USB | FSK | 300 Hz — 550 Hz | Russia | |
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| CIS-40.5 | CIS-40.5 (Also known as T-206) is an FSK signal used in Russian Military Communications Equipment. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Russia | |
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| CIS-48 | CIS-48 is an interesting data mode with a unique format. It uses a 4 DBPSK Preamble with a constant tone and changing OFDM modes as it transmits data. Origin is suspected to be in Russia. | 5.017 MHz — 17.289 MHz | USB | PSK | 2 MHz — 3 MHz | Russia | |
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| CIS-50-50 | CIS-50-50 is very similar to CIS-36-50. The main difference is in the available baud rates and frequency shifts used. | 3 MHz — 30 MHz | USB | FSK | 150 Hz — 630 Hz | Russia | |
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| CIS-8181 | CIS-8181 is an FSK modem used by the Russian navy. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Russia | |
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| CLOVER 2000 | CLOVER 2000 is an upgrade to CLOVER-II, a digital data protocol developed by Ray Petit and HAL Communications. Sometimes referred to as XCLOVER or 8 Tone CLOVER. | 3 MHz — 30 MHz | USB | PSK, QAM | 2 kHz | Worldwide | |
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| CLOVER 2500 | CLOVER 2500 is a new upgrade to CLOVER-2000, adding 25% more speed to the CLOVER system. | 3 MHz — 30 MHz | USB | PSK, QAM | 2.5 kHz | Worldwide | |
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| CLOVER-I | CLOVER-I was the first iteration of the Clover series of digital modes. Was never released for commercial use, replaced by CLOVER-II. Also known as Cloverleaf. | 3 MHz — 30 MHz | USB | PSK, QAM | 100 Hz | Worldwide | |
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| CLOVER-II | CLOVER-II is the advancement of CLOVER-I, with 4 tone pulses and a max data rate of 750 bps. Also known as Q-CLOVER and QUAD-CLOVER. | 3 MHz — 30 MHz | USB | PSK, QAM | 500 Hz | Worldwide | |
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| CODAR | CODAR (Coastal Ocean Dynamics Applications Radar) is used for near-surface ocean monitoring, such as waves and water current. | 4.438 MHz — 42.5 MHz | USB | ILFM | 50 kHz | Worldwide | |
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| CRY2001 Voice Scrambler | CRY2001 is a voice scrambling mode used on Sailor CRY2001 Scramblers. Fisherman often use these modes to communicate with privacy. | 3 MHz — 300 MHz | USB | FSK | 3 kHz | Worldwide | |
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| CV-786 | CV-786 is a wideband FSK mode built in Rockwell-Collins MDM-2001 modems. Also known as TRC-75, as it was used in TRC-75 transceivers. A military-based Radio TeleTYpe mode. | 3 MHz — 30 MHz | USB | FSK | 900 Hz | Worldwide | |
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| Chinese 4+4 | Chinese 4+4, also known as 4+4 or PRC 4+4, is a multi-carrier transmission mode. It used by Chinese Diplomatic services with most traffic originating from Beijing, China. | 3 MHz — 30 MHz | USB | PSK | 2.5 kHz | China | |
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| Chinese Firedrake Jammer | The Chinese Firedrake Jammer (also known as FireDragon) is a Commercial AM Broadcast jamming signal that aims to jam specific radio stations in Asia from being received by listeners. It plays the chinese folk song "The Firedrake" to jam AM radio stations. | 6 MHz — 18 MHz | AM | AM | 10 kHz | China | |
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| Codan Data Modem | Codan Data Modulation for Codan Data Modems. Has 3 distinct signals: Data, ALE, and SELCAL. This modulation is used in Codan's 9001, 9002, 3012 and 3212 modems. | 3 MHz — 30 MHz | USB | PSK, FSK | 400 Hz — 2.56 kHz | Worldwide | |
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| Coherent BPSK | Coherent BPSK, also known as C-BPSK, was an experimental amateur mode developed by Bill DeCarle VE2IQ. | 138 kHz — 18.081 MHz | USB | PSK | 200 Hz | Worldwide | |
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| Coherent CW | Coherent CW (also known as CCW) was a strictly timed morse code mode designed by Ray Petit W7GHM (The same inventor of CLOVER). CCW depended on accurate timing from both receiver and transmitter. | 3 MHz — 30 MHz | USB | OOK | 1 Hz | Worldwide | |
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| Contestia | Contestia, developed by Nick Fedoseev (UT2UZ) in 2005, is a digital mode derived from Olivia. It aims to deliver a compromise of speed and performance. | 3 MHz — 30 MHz | USB | MFSK | 150 Hz — 2 kHz | Worldwide | |
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| Coquelet | Coquelet is an MFSK system, similar to Piccolo. Also known as COQ-8, COQ-12, and COQUELET 8 V 2. Uses ITA-2 charset. It's two main modes are Coquelet-8 and Coquelet-13. No longer in use. | 3 MHz — 30 MHz | USB | MFSK | 300 Hz — 500 Hz | Worldwide | |
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| DUP-ARQ | DUP-ARQ, also known as ARTRAC and 125-ARTRAC, is a semi-duplex ARQ system once used by Thai and Hungarian Diplomatic services. | 3 MHz — 30 MHz | USB | FSK | 325 Hz | Worldwide | |
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| DUP-ARQ-2 | DUP-ARQ-2 (also known as ARTRAC II) is a further development of the DUP-ARQ system and the system characteristics are very similar. DUP-ARQ-2 allows transmission of ITA-2 (Baudot) or ITA-5 (ASCII) characters depending on the application. | 3 MHz — 30 MHz | USB | FSK | 1.3 kHz | Worldwide | |
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| DUP-FEC-2 | DUP-FEC-2 is a further development of the DUP-ARQ system and the system characteristics are very similar. Uses FEC instead of ARQ and runs at either 125 bd or 250 bd. | 3 MHz — 30 MHz | USB | FSK | 1.1 kHz | Worldwide | |
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| Datawell Buoy HF Link | Datawell Buoy HF Links transmitted by Datawell Marine measurement buoys, measuring ocean conditions, temperature, and wave current. | 25.5 MHz — 45 MHz | USB | FSK, MFSK | 200 Hz — 400 Hz | Worldwide | |
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| Digital Radio Mondiale (DRM) | Digital Radio Mondiale (DRM) is a digital commercial broadcasting mode used to deliver FM-comparable sound quality to shortwave radio. | 909 kHz — 26.06 MHz | USB | QAM, OFDM | 4.5 kHz — 20 kHz | Worldwide | |
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| DominoEX | DominoEX, also known as just Domino, is an IFK (Incremental Frequency Keying) mode developed by Murray Greenman ZL1BPU and Con Wassilieff ZL2AFP in 2004 that was the first fully developed iteration of the Domino IFK family modes. Used to send text over RF. | 5.332 MHz — 28.117 MHz | USB | IFK | 173 Hz — 524 Hz | Worldwide | |
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| DominoF | DominoF was the first experimental implementation of the Domino family of IFK modes, developed by Con ZL2AFP. DominoF used dual interleaved tone sets. Superseded by DominoEX. | 1.838 MHz — 28.08 MHz | USB | IFK | 220 Hz | Worldwide | |
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| Eurobalise downlink | Downlink from train to balise | 27.095 MHz | AM | Europe | |
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| FEC-A | FEC-A, also known as FEC-100 or FEC-100A, is a synchronous simplex ARQ system that uses the ITA 2 alphabet. This mode was once used by many embassies, diplomatic services, and news agencies worldwide. This mode was developed by Siemens. | 3 MHz — 30 MHz | USB | FSK | 100 Hz — 1.2 kHz | Worldwide | |
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| FSQ | Fast Simple QSO (FSQ) is an amateur radio digital modulation mode developed by Con Wassilieff ZL2AFP with Murray Greenman ZL1BPU in 2015. | 3.58 MHz — 10.149 MHz | USB | IFK+ | 300 Hz | Worldwide | |
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| FT8 | FT8 is an amateur radio QSO communication protocol | USB | MFSK | 50 Hz | Worldwide | |
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| FreeDV COHPSK | FreeDV Coherent PSK (Also known as FreeDV 700) is a robust Digital Voice mode developed by David Rowe for his FreeDV Digital Voice Software. | 3 MHz — 30 MHz | USB | PSK | 1.5 kHz | Worldwide | |
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| Frequency Division Multiplex Digital Voice (FDMDV) | Frequency Division Multiplex Digital Voice (FDMDV), also known as FDMDV 14+1-tone, is a digital voice mode originally developed by Peter Martinez G3PLX and Francesca Lanza HB9TLK. It has since been improved upon by David Rowe. | 3 MHz — 30 MHz | USB | PSK | 1.125 kHz — 1.3 kHz | Worldwide | |
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| G-TOR | Golay-Teleprinting Over Radio (G-TOR) is an FSK proprietary standard developed by Kantronics Inc. and is used by radio amateurs, military (Irish Air Corps/Navy, Mexican army) and governmental agencies (ICRC). | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Worldwide | |
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| GM2100 (R&S) | Advanced HF waveform for data transmission. R&S proprietary. PSK8, 2400 sps. | 3 MHz — 30 MHz | USB | PSK | 3 kHz | Europe | |
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| GMDSS Digital Selective Calling | Global Maritime Distress and Safety System's Digital Selective Calling (GMDSS-DSC) is a maritime communication protocol intended to initiate ship-to-ship, ship-to-shore and shore-to-ship radiotelephone and MF/HF radiotelex calls. | 2.177 MHz — 156.525 MHz | USB | FSK | 350 Hz | Worldwide | |
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| Globe Wireless HF Network | Globe Wireless' Maritime Digital Radio was a system of 24 stations around the globe offering data services to large cargo vessels. Since 2014, GW has discontinued their HF network. | 3 MHz — 30 MHz | USB | PSK, FSK, OFDM | 400 Hz — 2 kHz | Worldwide | |
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| HC-265 Voice Scrambler | HC-265 is a Voice Scrambling mode developed by Hagelin Crypto for their HC-265 CRYPTOCOM secure voice unit. | 3 MHz — 30 MHz | USB | FSK | 2.25 kHz — 3 kHz | Worldwide | |
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| HC-ARQ | Haegelin Crypto ARQ (HC-ARQ) was an FSK synchronous simplex ARQ system used by the UN and International Rescue Committee. This mode has been phased out and is no longer in use. | 3 MHz — 30 MHz | USB | FSK | 300 Hz | Worldwide | |
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| HFGCS (High Frequency Global Communications System) | HFGCS is a series of networks deployed by the United States Air Force to send encoded messages to deployed aircraft. This network is well known for it's coded EAM's (Emergency Action Messages) used for coordinating United States Strategic Nuclear Forces. | 4.724 MHz — 15.016 MHz | USB | USB | 2.95 kHz | Worldwide | |
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| HNG-FEC | HNG-FEC was a full duplex system developed and used solely by the Ministry of Foreign Affairs in Hungary. Used 100.05 bd with 500 Hz shift FSK. This mode is no longer used today. | 2.4 MHz — 24 MHz | USB | FSK | 600 Hz | Hungary | |
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| Hellschreiber | Hellschreiber (Also known as Feld Hell or just Hell) is a teleprinter system developed in the late 1920's by Rudolf Hell, a German inventor. | 3 MHz — 30 MHz | USB | OOK, FSK, MSK | 350 Hz — 800 Hz | Worldwide | |
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| High Frequency Active Auroral Research Program (HAARP) | HAARP is a ionospheric research program conducted in Gakona, Alaska. | 2.7 MHz — 10 MHz | AM, CW | CW, FMCW | 100 kHz | United States | |
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| High Frequency Data Link (HFDL) | HFDL, also known as HF-ACARS, ARINC 753, ARINC 635, and HF DATALINK,is a data link that aircraft use to communicate short messages over long distances using HF signals. | 2.9 MHz — 22 MHz | USB | PSK | 2.4 kHz | Worldwide | |
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| High Frequency Data and Voice Link (HFDVL) | HFDVL (or HFD+VL) is an experimental mode developed by research groups from The University of Las Palmas de Gran Canaria and The Polytechnic University of Madrid. This mode is intended for military use in accordance with STANAG 5066 parameters. | 14.35 MHz — 14.829 MHz | USB | PSK, OFDM, QAM | 3 kHz | Spain | |
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| High Power Auroral Stimulation (HIPAS) | 2.85 MHz — 4.53 MHz | United States | — | |
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| ICAO Selcal | ICAO Selcal (also known as AVCALL, ANNEX 10, or just SELCAL) is a HF/VHF aviation selective calling system used by ground stations to initiate radio communications with aircraft. | 3 MHz — 300 MHz | USB | MFSK | 1.5 kHz | Worldwide | |
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| IRA-ARQ | IRA-ARQ, also known as BULG-ASCII and ASCII-ARQ, is a high data rate ARQ FSK system used by Bulgarian, Slovakian, and Czech diplomatic stations. The maximum speed of this mode has been seen to reach 1200 bd. Not seen much much nowadays | 3 MHz — 30 MHz | USB | FSK | 650 Hz — 1.35 kHz | Worldwide | |
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| Improved Automatic Link Set-up (ALIS-2) | ALIS-2, also known as RS-ARQ, RS ARQ 240, and MERLIN, is an improvement of the original ALIS system. ALIS-2 is used in the Rohde & Schwarz MERLIN modem. | 3 MHz — 30 MHz | USB | FSK | 2 kHz | Worldwide | |
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| Ionosonde | An Ionosonde (Also known as a chirpsounder or ionospheric sounder) is a radar that examines the Ionosphere and monitors HF propagation conditions by sweeping the HF band and receiving the echoes. | 1 MHz — 40 MHz | USB | FMCW | 1 Hz | Worldwide | |
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| Iranian Navy QPSK Modem | Iranian Navy QPSK Modem is a QPSK mode used by the Iranian Navy. It has gone through several versions. The current version (2015) is V2 and supports speeds of 468 Bd, 936 Bd, and 1872 Bd. | 8.046 MHz — 17.382 MHz | USB | PSK | 300 Hz — 2.85 kHz | Iran | |
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| Israeli Intelligence VFT | Israeli Intelligence based FSK VFT. | 3 MHz — 30 MHz | USB | FSK | 3.1 kHz | Israel | |
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| Israeli Navy Hybrid Modem (188-110 MOD) | The Israeli Naval Hybrid Modem is based on the MIL-STD-188-110 Serial Standard. Has characteristic preamble with 4/6 Tone and 18 QPSK parallel mode before 110 Serial transmission. Possible use as a broadcast transmitter for ships. Used by the Israeli Navy 4XZ station from Haifa. | 3 MHz — 30 MHz | USB | PSK | 2.75 kHz | Israel | |
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| Israeli VFT | Israeli based VFT transmission, most likely used by Israeli government or military. | 3 MHz — 30 MHz | USB | FSK, PSK | 3.1 kHz | Israel | |
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| JT65 | JT65 is an amateur radio QSO communication protocol developed by Joe Taylor, K1JT. JT65 has 3 submodes: JT65A, JT65B, and JT65C. The most popular submode of JT65 is JT65A. JT65 gets '65' from the 65 tones it uses. | 1.838 MHz — 50.276 MHz | USB | MFSK | 180 Hz — 710 Hz | Worldwide | |
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| JT9 | JT9 is a very narrow 9-FSK mode for making contact (QSO's) under extreme weak-signal conditions. | 3.578 MHz — 28.079 MHz | USB | MFSK | 20 Hz | Worldwide | |
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| JTMS | JTMS is a meteor scatter mode that uses MSK. JTMS behaves similarily to FSK441. | 3 MHz — 30 MHz | USB | MSK | 1.7 kHz | Worldwide | |
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| Japan Military 8-Channel FSK | Data signal thought to originate from Japanese Military/Navy | 12.385 MHz — 16.554 MHz | USB | FSK | 2.4 kHz | Japan | |
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| Japanese Slot Machine (XSL) | The Japanese Slot Machine (Enigma Designation XSL) is a simplex system used by the Japanese Maritime Self-Defense Force in Ichihara, Japan. | 4.153 MHz — 8.703 MHz | USB | PSK | 2 kHz | Japan | |
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| Jindalee Operational Radar Network (JORN) | JORN is an Australian OTHR system that operates uniquely in that it's radar bursts include an intro tone before the burst. | 8.992 MHz — 22.95 MHz | USB | FMCW | 10 kHz | Australia | |
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| KG-STV | KG-STV is an image transmission mode developed by JJ0OBZ in Japan. | 3.733 MHz — 14.233 MHz | USB | FSK | 500 Hz — 2.5 kHz | Worldwide | |
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| Lentus | Lentus is an extremely slow QRP mode developed by Patrick Lindecker F6CTE used to transmit QRP's at very low power. Each 43-character (75 bit) transmission takes roughly 5 minutes to transmit across 32 possible tones in a tight 25 Hz bandwidth. | 136.3 kHz — 14.096 MHz | USB | MFSK | 25 Hz | Worldwide | |
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| Link-11 | Link-11 (Also known as ALLIGATOR, STANAG 5511, TADIL-A, MIL-STD-6011, and MIL-STD-188-203-1A) is a Tactical Data Link standard (formerly known as Tactical Digital Information Link (TADIL) used by NATO and the US Military for Maritime Tactical Data Exchange. | 2 MHz — 30 MHz | USB | PSK | 2.5 kHz — 6 kHz | Worldwide | |
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| MD-522 | MD-522 (Also known as MIL-M-55529A) is a synchronous FSK mode built into GRC-MD522 teletypewriter sets and used for wirelessly transmitting ASCII information. MD-522 has a narrowband, wideband, and diversity mode. | 3 MHz — 30 MHz | USB | FSK | 200 Hz — 300 Hz | United States | |
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| MD-674 | MD-674, also known as Wireline FSK, is a very old United States Military FSK Modem from the 1960's. Uses 85 Hz FSK shift. Speeds of 50 Bd, 75 Bd, 100 Bd, and 150 Bd have been logged. No longer seen today. | 3 MHz — 30 MHz | USB | FSK | 200 Hz — 300 Hz | United States | |
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| MIL-STD-110-342 | MIL-STD-110-342 was a US Dept. of Defense standard for a 16 channel VFT teletype transmission. This mode was officially cancelled as of December 5th, 1995. | 3 MHz — 30 MHz | USB | FSK | 3.1 kHz | Worldwide | |
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| MIL-STD-188-110 Appendix A 16-Tone | MIL-STD-188-110 Appendix A is a 16-tone OFDM PSK signal used to transmit data. As of 110C revision, this mode has been phased out. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.1 kHz | Worldwide | |
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| MIL-STD-188-110 Appendix B 39-Tone | MIL-STD-188-110 Appendix B is a 39-tone OFDM DQPSK mode used to send data and voice. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.4 kHz | Worldwide | |
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| MIL-STD-188-110 Serial | MIL-STD-188-110 Serial is a US Department of Defense standard for HF Communications, Serial PSK mode. Can transmit both data and voice with a range of interleaving and speed modes for optimal propagation. | 3 MHz — 30 MHz | USB | PSK | 2.75 kHz | Worldwide | |
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| MSM-1250 Modem | MSM-1250 (Medium Speed Modem) is a 10 FSK-2 OFDM digital data protocol used by the stand-alone modem "SkyFax", used to transmit and receive faxes on HF. | 3 MHz — 30 MHz | USB | FSK | 2.4 kHz — 2.5 kHz | Worldwide | |
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| MT63 | MT63 is a Orthogonal Frequency Division Multiplexed (OFDM) digital data mode aimed for use in high noise environments. | 3 MHz — 30 MHz | USB | OFDM, PSK | 500 Hz — 2 kHz | Worldwide | |
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| Marconi Selenia 25-Tone Modem | The Marconi Selenia 25-Tone Modem is a military modem developed sometime around 2003 by Marconi Selenia Communications (Now Finmeccanica). It supports ECCM capability and transmits at a datarate of 2400bps. | 3 MHz — 30 MHz | USB | PSK, OFDM | 1.6 kHz | Worldwide | |
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| Mazielka (X06) | Mazielka (X06) is a diplomatic selcall system used by the Russian Ministry of Foreign Affairs. Used to alert that a Serdolik transmission is going to occur soon, usually on a different frequency. | 4.963 MHz — 23.458 MHz | USB | MFSK | 200 Hz | Russia | |
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| Modernised High Frequency Communications System (MHFCS) | The Modernised High Frequency Communications System (MHFCS) is an Australian Department of Defense HF System for their military communications network. Also known as AUS MIL ISB Modem, AUS MHFCS, and ADF HFCS. | 2.01 MHz — 27.478 MHz | USB | FSK | 400 Hz — 750 Hz | Australia | |
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| Morse Code (CW) | CW Morse Code is the simplest form of transmission found virtually all over the RF bands for a variety of uses. The most common use of this is for Call-sign Beacons by both Amateur and Military operators. | 3 kHz — 250,000 MHz | CW | OOK | 1 Hz | Worldwide | |
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| Multi Frequency Shift Keying (MFSK) | MFSK is a family of multi-frequency shift keying digital transmission modes. MFSK-8 and MFSK-16 are two well-known amateur radio modes. | 3 MHz — 30 MHz | USB | MFSK | 154 Hz — 630 Hz | Worldwide | |
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| Multitone Paging | Multitone Paging signal, developed by Multitone Electronics in the UK. Uses similar coding to POCSAG but the headers are different and only work with Multitone's range of paging products | 25 MHz — 470 MHz | NFM | FFSK | 12.5 kHz — 25 kHz | Worldwide | |
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| Nokia Adaptive Message Terminal | The Nokia Adaptive Message Terminal, also known as Nokia Adaptive Burst Modem and Kryapp 302, is a Finnish encrypted messaging system suggested to be used by Finnish Intelligence Services and Swedish Military. | 3 MHz — 30 MHz | USB | FSK | 1 kHz — 1.6 kHz | Worldwide | |
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| North Korean Diplo FSK | North Korean Diplomatic FSK link, teletype radio diplomatic usage. Also known as DPRK-FSK, KRE-FSK, DPRK-ARQ, and KEGURI. Has a FEC stream mode and a burst ARQ mode. | 9 MHz — 29 MHz | USB | FSK | 1.2 kHz — 1.4 kHz | North Korea | |
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| North Korean Diplo PSK | North Korean Diplomatic PSK link. Also known as KRE-PSK. Four speed modes have been seen, 150 bd, 300 bd, 600 bd, and 1200 bd. All use BPSK modulation. The main identifying feature of this signal are the preambles and end of transmission patterns. | 9 MHz — 29 MHz | USB | PSK | 300 Hz — 2.4 kHz | North Korea | |
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| Olivia | OLIVIA is an amateur digital teletype mode designed by Pawel Jalocha SP9VRC in 2005. It's goal was to be effective even in poor propagation conditions. | 3 MHz — 30 MHz | USB | MFSK | 125 Hz — 2 kHz | Worldwide | |
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| PACKET | PACKET, also known as FSK300, AX25, and X25, is a packet based protocol derived from AX.25 and HDLC computer network protocols. Packet radio is a synchronous system in which data is transmitted in ASCII character packets. | 3 MHz — 800 MHz | USB | FSK | 730 Hz | Worldwide | |
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| PACTOR I | PACTOR-I is a digital data protocol combining elements of PACKET and AMTOR ARQ. | 3 MHz — 30 MHz | USB | FSK | 300 Hz | Worldwide | |
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| PACTOR II | PACTOR II is an advancement of PACTOR I. It is up to 8 times faster than PACTOR I. | 3 MHz — 30 MHz | USB | PSK | 450 Hz | Worldwide | |
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| PACTOR III | PACTOR III introduces 6 speed levels that provide higher throughput and improved robustness compared to PACTOR I and II. PACTOR III is on average 3.5 times faster than PACTOR II. With optimal conditions, PACTOR III becomes over 5 times faster. | 3 MHz — 30 MHz | USB | PSK | 400 Hz — 2.4 kHz | Worldwide | |
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| PACTOR IV | PACTOR IV is the newest iteration of the PACTOR series, advancing from PACTOR I-III. It is 1.5x-3x faster than PACTOR III, and has 10 speed levels. | 3 MHz — 30 MHz | USB | PSK, QAM | 300 Hz — 2.4 kHz | Worldwide | |
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| PAX | PAX and PAX2 are developed by Patrick Lindecker F6CTE in 2005, and was derived from Olivia. It utilizes the AX.25 protocol that PACKET uses, and had a minimum SNR of -10dB. Can transmit APRS frames. | 3.59 MHz — 144.62 MHz | USB | MFSK | 500 Hz | Worldwide | |
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| PLUTO II OTH Radar | PLUTO II is an Over The Horizon Radar located in the Sovereign Base Area just outside RAF Akrotiri in Cyprus. PLUTO II is very active in Europe. | 8 MHz — 38 MHz | USB | FMCW | 20 kHz | Cyprus | |
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| POCSAG | POCSAG (Post Office Code Standardisation Advisory Group), also known as Super-POCSAG, Radio Paging Code No. 1 or RPC1, is a one-way 2FSK paging protocol that supports 512, 1200, and 2400 bps. | 25 MHz — 932 MHz | NFM | FSK | 9 kHz | Worldwide | |
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| POL-ARQ | POL-ARQ was a duplex ARQ system used by Polish and Italian diplomatic services. This system uses the CCIR 476-4 alphabet with polatiry retained. No longer in use. | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Europe | |
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| PRC-16 | PRC-16 is a Chinese sourced PSK data link, traced to Shanghai. Suspected user Chinese Military. | 14.3 MHz | USB | PSK, OFDM | 2.2 kHz | China | |
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| PSK-AM | PSK-AM is an amateur digital mode developed by Patrick Lindecker F6CTE in 2002/2003, and incorporates FEC interleaving. PSK-AM uses the modulation of PSK10/31 with the FEC of SITOR-B. | 10.148 MHz — 144.62 MHz | USB | PSK | 40 Hz — 180 Hz | Worldwide | |
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| Panther-H Modem | Panther-H is an intelligent frequency hopping transceiver developed by Racal (now Thales Group). Has a signature 8-burst SOC (Start Of Conversation) sync procedure. Used in Panther-2000H radios | 1.5 MHz — 30 MHz | USB | PSK | 3 kHz | Worldwide | |
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| Phase Shift Keying (PSK) | PSK is a digital teletype mode based on Phase-Shift Keying (PSK) modulation. The most popular amateur radio PSK mode is PSK 31. | 1.838 MHz — 909 MHz | USB | PSK | 10 Hz — 1 kHz | Worldwide | |
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| Piccolo | Piccolo was a MFSK system developed by the UK Foreign and Commonwealth Office (FCO) to communicate with foreign embassies and UK military stations around the world. No longer used. | 3 MHz — 30 MHz | USB | MFSK | 180 Hz — 300 Hz | Worldwide | |
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| Polish Intelligence 100bd 625Hz FSK | One-way broadcast system, used by one of Polish intelligence agencies for delivery of messages to their operatives abroad on fixed schedules. | 4 MHz — 20 MHz | USB | FSK | 3.5 kHz | Poland | |
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| Pulse Coded Modulated (PCM) RC Toy | Signal used for remote control (RC) Toys. | 27.145 MHz — 49 MHz | PCM | Worldwide | |
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| Q-MAC HF Modem | The Q-MAC HF Modem is a military modem developed by Q-MAC (acquired by Barrett Communications). It uses OFDM with a BPSK sync channel in a gap of the signal. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2 kHz | Worldwide | |
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| Q15X25 | Q15X25, also known as NEWQPSK, is an experimental amateur radio packet modem developed by Pawel Jalocha SP9VRC. Q15X25 is a OFDM QPSK implementation of the AX.25 Packet protocol used in PACKET. | 3.585 MHz — 14.109 MHz | USB | PSK, OFDM | 1.95 kHz — 2.35 kHz | Worldwide | |
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| RAC-ARQ | RAC-ARQ, also known as MEROD and RACAL-ARQ, is a teleprinter system by Racal, used in MEROD devices. MEROD stands for Message Entry and Read Out Device. Hasn't been seen since 2010. | 3 MHz — 30 MHz | USB | FSK | 1 kHz — 1.3 kHz | Worldwide | |
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| ROS | ROS is an amateur radio teletype free running QSO mode designed for low signal/high noise conditions. | 1.8 MHz — 30 MHz | USB | CDMA, Phase Continious MFSK | 2 kHz | Worldwide | |
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| RTTYM | RTTYM, developed by Nick Fedoseev (UT2UZ) in 2005, is a digital mode derived from Olivia. It aims to deliver a compromise of speed and performance. RTTYM is about 4x faster than Olivia, but trades the speed for reduced robustness and sensitivity. | 3 MHz — 30 MHz | USB | MFSK | 150 Hz — 2 kHz | Worldwide | |
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| RUM-FEC | RUM-FEC, also known as ROU-FEC and SAU-FEC, is a FSK FEC system used by Romanian diplomatic services. This is no longer used today, replaced by MIL-STD 188-110 Serial. | 3 MHz — 30 MHz | USB | FSK | 750 Hz | Romania | |
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| RUM-MOI FEC | RUM-MOI FEC, also known as RUM-MIL 115.76 Bd, is a FSK FEC mode used by the Romanian Ministry of Internal Affairs, supposedly under military use. This is no longer used today, replaced by MIL-STD 188-110 Serial. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Romania | |
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| RWM | RWM is a Russian shortwave time signal station. | 4.996 MHz — 14.996 MHz | USB | OOK | 5 Hz | Russia | |
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| Radio Teletype (RTTY) | RTTY (Also known as Baudot or ITA2) uses the Baudot 5-bit alphabet with FSK to send text messages over the shortwave. This mode is gradually dying out in favor of more robust modes like PSK31 in the amateur service. | 147.3 kHz — 28.15 MHz | USB | FSK | 85 Hz — 850 Hz | Worldwide | |
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| Redundant Digital File Transfer (RDFT) | RDFT is an amateur radio digital mode used to transmit files. | 9.065 MHz — 9.24 MHz | USB | PSK | 1.8 kHz | Worldwide | |
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| Rezonans-N type radar | This is radar working about 10 seconds per hour every day on different frequencies. | 3 MHz — 24 MHz | USB | FMOP | 20 kHz — 40 kHz | Russia | |
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| Robust PACKET | Robust PACKET, also known as HF-APRS, RPR, Winlink RMS, and APRSlink, is an OFDM version of the amateur mode PACKET which is optimized for shortwave use. This mode was developed by Spezielle Communications Systeme GmbH & Co. KG (SCS). | 3.61 MHz — 14.103 MHz | USB | PSK, OFDM | 500 Hz | Worldwide | |
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| Russian Diplo VFT PSK 64Bd | Russian Diplomatic 3 channel VFT PSK running at 64 Bd. Enigma M42 designation | 4.022 MHz — 23.131 MHz | USB | PSK | 2.5 kHz | Russia | |
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| Russian Intelligence 200bd 1000Hz FSK | One-way error-correcting broadcast system, used by one of Russian intelligence agencies for delivery of messages to their operatives abroad on fixed schedules. | 4 MHz — 23 MHz | USB | FSK | 1 kHz | Russia | |
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| SI-ARQ | SI-ARQ, also known as ARQ-S and ARQ-1000S, is a simplex ARQ system designed by Siemens formerly used by Austrian and Indonesian diplomatic services. No longer used today. | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Europe | |
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| SI-FEC | SI-FEC, also known as FEC-S, FEC 1000 Simplex, and FEC-1000S, was the FEC variant of SI-ARQ, and was only used under extremely poor propagation conditions. SI-FEC was developed by Siemens and was used by Austrian and Indonesian diplomatic services. | 3 MHz — 30 MHz | USB | FSK | 280 Hz | Europe | |
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| SITOR-A | SITOR-A (Also known as AMTOR-A) is one of two modes of SITOR, which stands for Simplex Teletype Over Radio. | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Worldwide | |
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| SITOR-B | SITOR-B is one of two modes of SITOR (Simplex Teletype Over Radio). | 3 MHz — 30 MHz | USB | FSK | 350 Hz | Worldwide | |
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| SP-14 (XP) | SP-14 (XP) was a 14 tone MFSK mode with origins from the Russian Intelligence and Foreign Ministry. Also known as NUM-13. Inactive since 2005, superseded by XPA. | 9 MHz — 12 MHz | AM | MFSK | 1.2 kHz | Russia | |
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| SPREAD | SPREAD, also known as AUTOSPEC Mk2, SPREAD-11, SPREAD-21, and SPREAD-51, was a FEC system used by Romanian diplomatic stations and the Brazilian Navy and shore stations. SPREAD is considered the successor to AUTOSPEC. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Worldwide | |
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| STANAG 4197 | STANAG 4197 is a NATO QPSK OFDM signal used in ANDVT modems that transmit encrypted digital voice over HF. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.3 kHz | Worldwide | |
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| STANAG 4285 | STANAG 4285 is specified by the NATO (North Atlantic Treaty Organization) Military Agency for Standardization in "Characteristics of 1200 / 2400 / 3600 Bits per Second Single Tone Modulators / Demodulators for HF Radio Links" | 1.89 MHz — 22.7 MHz | USB | PSK | 2.75 kHz | Worldwide | |
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| STANAG 4415 | STANAG 4415 is a NATO standard for robust, non-hopping digital data communication, used on severely degraded HF channels with large Doppler and multipath spreads. | 3 MHz — 30 MHz | USB | PSK | 2.75 kHz | Worldwide | |
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| STANAG 4481 | STANAG 4481, also known as CRATT, Link-4, and NATO-75, is specified by the NATO (North Atlantic Treaty Organization) Military Agency for Standardization as a "Minimum technical equipment standards for naval HF shore-to-ship broadcast system" | 2.815 MHz — 18.016 MHz | USB | FSK, PSK | 1.5 kHz — 2.75 kHz | Worldwide | |
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| STANAG 4529 | STANAG 4529 a modification of STANAG 4285 to deliver data and voice in 1240 Hz of bandwidth at rates of up to 1800 bps. | 3 MHz — 30 MHz | USB | PSK | 1.24 kHz | Worldwide | |
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| STANAG 4539 | STANAG 4539 or MIL-STD-188-110B/C Appendix C is a HDR (110B) / MDR (110C) serial PSK/QAM signal that can reach speeds up to 9600 bps (128000 bps with no interleaving). | 3 MHz — 30 MHz | USB | PSK, QAM | 3 kHz | Worldwide | |
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| SWED-ARQ | SWED-ARQ, also known as ARQ-SWE, was a Swedish simplex ARQ system used by Swedish diplomatic services. This protocol supported three packet lengths and was able to change packet length mid-transmission. No longer used today. | 3 MHz — 30 MHz | USB | FSK | 600 Hz | Sweden | |
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| Saab Grintek MHF-50 MFSK Modem | The MHF-50 MFSK Modem by Saab Grintek Technologies in South Africa is a data modem that utilizes RTTY, 2-FSK, and 33-MFSK to transmit data | 4.245 MHz — 12.982 MHz | USB | MFSK, FSK | 2.2 kHz | South Africa | |
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| Serdolik | Serdolik is a MFSK signal used by the Russian diplomatic service. | 3 MHz — 30 MHz | USB | MFSK | 1.4 kHz | Russia | |
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| Siemens CHX-200 FSK Modem | CHX200, also known as Siemens CHP200 and PRC-921/GY, is a backpack HF ECCOM transceiver, designed and built by Siemens. | 1.5 MHz — 30 MHz | USB | FSK | 300 Hz | Worldwide | |
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| Single Sideband Voice | Single side band, either lower side band or upper side band, is an AM modulated voice channel with one sideband suppressed. Used in the HF band by radio-amateurs and aircraft weather reports. | 3 MHz — 30 MHz | SSB | AM | 1.9 kHz | Worldwide | |
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| Slow-Scan Television (SSTV) | Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images. | 3 MHz — 300 MHz | USB | FM | 2.5 kHz | Worldwide | |
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| SuperDARN (Super Dual Auroral Radar Network) | SuperDARN is an international radar network used for scientific purposes. They are used to track and study all sorts of atmospheric phenomena. | 10 MHz — 12 MHz | 6 kHz | Worldwide | |
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| T-230-1A 'Mahovik' | Mahovik, "Flywheel" in Russian, is a PSK based mode that can transmit both voice and data. It is transmitted from a Russian T-230-1A radio transceiver. | 3 MHz — 30 MHz | USB | PSK | 2.5 kHz | Russia | |
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| THOR | THOR is an adaptation of DominoEX with MFSK16 binary varicode and FEC. | 3 MHz — 30 MHz | USB | IFK | 173 Hz — 524 Hz | Worldwide | |
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| THROB | THROB is a unique data mode that relies heavily on DSP techniques, using MFSK and AM modulation techniques together. | 3 MHz — 30 MHz | USB | MFSK | 72 Hz — 188 Hz | Worldwide | |
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| TT2300 | TT2300, also known as TT2300B, TT2300-ARQ, TRA-2300, and TPLEX, is an 8MFSK synchronous system developed by Thrane & Thrane of Denmark (acquired by UK defense firm Cobham in 2012). | 5.029 MHz — 7.72 MHz | USB | MFSK | 1.6 kHz — 1.7 kHz | Worldwide | |
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| TWINPLEX | TWINPLEX, also known as F7B4 and TWINPLEX-SITOR, was a diplex 4-FSK ARQ mode developed by Mackay Radio and Telegraph Company, based in New York City, in the early 1950's. TWINPLEX was used by Interpol, the United Nations, and other diplomatic services. | 3 MHz — 30 MHz | USB | MFSK | 450 Hz — 950 Hz | Worldwide | |
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| Thales SALAMANDRE (HFXL) | Thales SALAMANDRE (using HFXL waveform) uses up to 16 separate contiguous or not-contiguous narrowband HF channels for high datarate military and tactical communications. Operates on a modified STANAG-4539 platform. | 3 MHz — 30 MHz | USB | PSK | 150 kHz | Worldwide | |
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| Thales Système 3000 HF Modem | Thales Système 3000 is a HF modem capable of many different modes of transmission. It has a unique preamble and format to it's signals. | 1.5 MHz — 30 MHz | USB | PSK, MFSK | 2 kHz — 3 kHz | Worldwide | |
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| Thales Système 3000 Skyhopper | Thales Système 3000 Skyhopper is the frequency hopping mode of the Système 3000 Modem. Characterized by it's very short bursts and frequency hopping behavior. | 1.5 MHz — 30 MHz | USB | PSK, MFSK | 2 kHz — 2.6 kHz | Worldwide | |
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| Thales Système 3000 Voice Scrambler | Voice Scrambling mode from Thales Système 3000 HF Modem. Has characteristic PSK and MFSK bursts at the beginning and end of a voice transmission. | 1.5 MHz — 30 MHz | USB | PSK, MFSK | 3 kHz | Worldwide | |
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| The Goose | Channel marker of the Russian military station nicknamed "The Goose", for its distinct channel marker sound. Uses 3012kHz in nighttime, and 6360kHz in daytime. | 3.012 MHz — 6.36 MHz | USB | AM | 3.1 kHz | Russia | |
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| UK GOV MIL WINDRM51 | UK GOV/MIL "WinDRM51" variant. Unknown purpose, But link between UK & Cyprus has been found some years ago. | 9.104 MHz — 13.451 MHz | USB | OFDM | 2.5 kHz | Europe | |
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| UTC (Coordinated Universal Time) Time Standard | UTC (Coordinated Universal Time) time standard transmission from NIST (National Institute of Standards and Technology) stations WWV in Fort Collins, Colorado USA and WWVH in Kauai, Hawaii. | 2.5 MHz — 25 MHz | AM | 4 kHz | United States | |
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| VEZHA-S | Two-way 100 Bd/500 Hz Russian Telegraph system, attributed name VEZHA-C (Tower-S), usage claimed to be by Russian Ministry of Communications (MinComSvyaz Rossii). Possible usage in meteorology under callsign RWD59. | 2.755 MHz — 12.165 MHz | USB | FSK | 650 Hz | Russia | |
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| VISEL | VISEL, also known as YUG-MIL 120.9 Bd, FEC-12, and YUG-MIL FEC, is a synchronous teleprinter system used by the former Yugoslav military. No longer active today. | 3 MHz — 30 MHz | USB | FSK | 400 Hz | Europe | |
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| VOICE | VOICE is a MFSK mode developed by Patrick Lindecker F6CTE in 2006, and was derived from Olivia. It was designed for blind or partially sighted amateur radio operators. | 3 MHz — 30 MHz | USB | MFSK | 200 Hz | Worldwide | |
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| WEFAX | Radiofax (Also known as Weatherfax, HF-FAX, WEFAX, and Weather Facsimile) is a slow scan analog image transmission mode used for the transmission of press images, weather charts, newspapers, and meteorological reports. | 3 MHz — 30 MHz | USB | FM | 3 kHz | Worldwide | |
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| WSPR | Weak Signal Propagation Reporter. | 136 kHz — 1,296.5 MHz | USB | MFSK | 6 Hz | Worldwide | |
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| WinDRM | WinDRM is an amateur radio derivation of the Digital Radio Mondiale (DRM) digital voice and data transmission protocol. Also known as HamDRM, and Digital SSTV. | 14.236 MHz | USB | QAM, OFDM | 2.2 kHz — 2.4 kHz | Worldwide | |
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| Yachta T-219 Voice Scrambler | Yachta or Yakhta (Russian for 'Boat') T-219 is an analogue voice scrambler. It is unique in that an FSK sync signal is transmitted in the middle of the main signal, with the scrambled voice stream split above and below the FSK signal. | 3 MHz — 30 MHz | USB | FSK | 2.7 kHz | Russia | |
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| Yugoslavian 16-Tone Modem | The Yugoslavian 16-Tone Modem, also known as YUG-Diplo 16-Tone, is a 16 tone OFDM PSK modem used in former Yugoslavia for diplomatic use. No longer used today. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.1 kHz | Europe | |
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| Yugoslavian 20-Tone Modem | The Yugoslavian 20-Tone Modem, also known as YUG-MIL 20-Tone and YUG Diplo 20-Tone, is a 20 tone OFDM PSK modem used in former Yugoslavia for military and diplomatic use. No longer used today. | 3 MHz — 30 MHz | USB | PSK, OFDM | 2.2 kHz | Europe | |